Grade 9 Electricity Practice Exam

These questions are part of the practice quiz. Start practicing

• What is an electromagnet?
• To strengthen an electromagnet without changing current, which of the following is most effective?
• What is the difference between a conductor and an insulator?
• What is a machine that generates electricity called?
• A 6 Ω resistor carries a current of 2 A. What is its electrical power dissipated?
• A resource that cannot be replaced as quickly as it is consumed.
• Which term describes the rate at which a device uses energy in an electrical system?
• Two light bulbs connected in parallel: if one burns out, what happens to the other?
• Which term describes a resource that is naturally replenished and will not run out soon?
• Which quantity is measured in ohms?
• Which equation relates energy, power, and time?
• Which component protects a circuit by breaking the circuit when current is too high?
• What is a continuous path in which electrons can flow called?
• In a parallel circuit with a 9 V source and resistors of 3 Ω and 6 Ω, what are the branch currents and total current?
• I=V/R is the formula for which quantity?
• Which term is a form of charge that can be positive or negative and exerts an electric force?
• What is a potential difference (voltage) across a component?
• P = V x I or P = E / T calculates which quantity?
• Which statement accurately describes a wet cell?
• A device has 9 V across it and a resistance of 3 Ω. What is the current?
• In a parallel circuit, what is true about the voltage across each branch?
• Which wire carries current away from the component and is coated in white plastic?
• In a series circuit with a fixed voltage source, what happens to the overall current when more resistors are added in series?
• If the voltage across a resistor remains the same and its resistance increases, what happens to the current?
• Which form of power is electricity generated by the tides moving sea water?
• Which term describes the energy produced by the flow of electrons in an electric circuit?
• A safety device in an electrical circuit is called a
• Define electrical power and its unit.
• The device that stores electrical energy using an electric field between plates is a
• Which equation correctly expresses energy in terms of power and time?
• Around a straight current-carrying wire, how is the magnetic field directed?
• Which term refers to a device that uses a temperature difference across thermocouples to generate electricity?
• Which energy release occurs when a nucleus splits into smaller parts?
• What energy conversion occurs in a generator?
• Electric power generated from the burning of fuels such as coal and natural gas
• Which device converts electrical energy into mechanical energy?
• Which material is a good conductor of electricity?
• A natural energy resource that is unlimited or can be replenished by natural processes in a relatively short period.
• What term describes a flow of electrons that alternates in direction in an electric circuit?
• What are the basic circuit symbols for a battery and a cell?
• Which object has more electrons than protons?
• State Ohm's Law with its formula.
• Which of the following equals electrical power for a resistor with current I and resistance R?
• R=V/I is the formula for which electrical component?
• Instrument designed to detect very small currents by responding to small currents.
• What is electric current?
• What energy conversion occurs in an electric motor?
• What does the symbol for a resistor look like in circuit diagrams?
• Which device reduces the flow of electric current in a circuit?
• Which expression correctly defines electrical power in terms of voltage and current?
• How does insulation help electrical safety?
• Which law describes that like charges repel and opposite charges attract?
• A lamp rated 24 W is connected to a 12 V supply. What current does it draw?
• Using Ohm's Law, what is the resistance when voltage is 6 V and current is 2 A?
• Which wire connects circuits in the home to the earth, giving charges an alternate path in case of a short circuit?
• A type of nuclear technology involving the controlled use of nuclear fission to release energy for work including propulsion, heat, and the generation of electricity.
• Which term describes an object with more electrons than protons?
• The difference in electric potential energy per unit charge measured at two points; measured in volts.
• A device used to measure potential differences (voltage).
• Why does adding resistors in parallel decrease total resistance?
• What is the unit of the electric current?
• In a parallel circuit, what is the voltage across each branch relative to the source voltage?
• Which term refers to the energy provided by the flow of electrons in an electric circuit?
• Which device is a reusable safety switch that breaks the circuit when the current becomes too high?
• Which term describes the electrical current produced by applying pressure to certain synthetic crystals, such as quartz?
• A 60 W lamp runs for 2 hours. How many kilowatt-hours (kWh) does it use?
• A device that converts light energy from any light source directly into electrical energy.
• Which electrolyte is described as a liquid that conducts current in a cell?
• Which term describes an object that has fewer electrons than protons?
• Which term describes electric power produced from burning fuels such as coal and natural gas?
• A circuit has a 12 V source and two resistors in series: 4 Ω and 8 Ω. What is the current?
• Which instrument is used to measure voltage?
• Which safety device melts a small metal strip to interrupt a circuit when too much current flows?
• A circuit has a 12 V source and two resistors in parallel: 4 Ω and 6 Ω. What is the total current?
• What does the current rating of a fuse mean?
• Which law describes the linear relationship between voltage and current in a circuit?
• Thermal pollution is best described as the warming of water caused by human activity that can harm aquatic life.
• Which statement describes resistors in parallel?
• In a parallel circuit, what is true about the voltage and currents in the branches?
• Which part of an electric circuit converts electrical energy into other forms?
• Which statement describes a secondary cell?
• Which device is used to measure resistance?
• What do you call the two plates in a simple electrical cell?
• An electric cell that can be recharged is called a?
• What is the total resistance of 6 Ω and 3 Ω when connected in parallel?
• What is the energy used by a 100 W device running for 0.5 hours?
• What term describes a material that lets electrons move easily through it?
• If a 12 V source feeds 8 Ω and 4 Ω in parallel, what is the total current?
• Which term describes the process of transferring electrons between neutral objects when they are rubbed together or touched?
• How does temperature typically affect the resistance of metals?
• If a wire carries current away from a component and is coated in white plastic, what is this wire called?
• A way of drawing an electric circuit using standard symbols.
• Comparison of the energy output of a device with the energy supplied.
• Which term describes an object with no net charge?
• A 18 V source is connected to a 4 Ω resistor. What is the current?
• Which term describes how well a device converts input energy into useful output energy?
• If a circuit has a 12 V source and a 4 Ω resistor, what is the current?
• V=IxR is the expression for which electrical quantity?
• A coil of wire with a soft iron core inside it that acts as a magnet when current is in the coil.
• What term describes the rate at which electrical energy is transferred or consumed?
• What safety practice should you follow when using plugs and cords?
• Which device converts chemical energy into electrical energy?
• A circuit in which the loads are connected by branches so that there are two or more paths for electrons to flow is called a
• A device that increases or decreases the voltage of alternating current
• What energy is captured by transforming the motion of air into electrical energy using a turbine?
• E = P x T is used to calculate which quantity?
• Why is it dangerous to touch a live exposed conductor?
• Which term best describes a device that consists of several thermocouples arranged in series?
• What is the function of a circuit breaker?
• Which device is described as a device that converts thermal energy into electrical energy?
• A 12 V battery is connected to a 6 Ω resistor. What is the current?
• How does increasing the number of turns in a coil affect the magnetic field when current is constant?
• Which term describes the rapid transfer of electric charge from one object to another?
• A device used to measure current in a circuit.
• What happens to resistance when a conductor is heated (for typical metals)?
• Why is grounding important in electrical safety?
• What is the relationship between energy (E), power (P), and time (t)?
• What is the purpose of using a ferromagnetic core in an electromagnet?
• How do you calculate the cost of electricity for a given energy use?
• What is electrical resistance and its unit?
• Which device converts mechanical energy into electrical energy?
• The use of a single fuel to generate electricity and to produce heat
• What is the total resistance of resistors 2 Ω, 3 Ω, and 5 Ω in series?
• How does lamp brightness relate to current in a resistor?
• Which term describes the rate of flow of electric charge in a circuit?
• The energy source in a circuit that stores chemical energy and supplies electrons.
• The unit used to measure electric current.
• An electrochemical cell in which the electrolyte is a liquid is known as a?
• The rate at which electrical energy is produced or used.
• Which term is used for the energy transported by electrical charges as they move through a circuit?
• Instrument used to measure current in amperes directly in a circuit.
• A device attached to the circuit which produces light is called a
• Which term is the general name for the flow of electric charge through a conductor?
• What is the term for an atom or molecule that has gained electrons?
• Which term describes the controlled flow of electrons through a conductor?
• Which term refers to a material that is a perfect conductor with zero resistance to the flow of electric charge?
• Which term describes a device that stores energy in a magnetic field and can produce motion when energized?
• Gases in Earth's atmosphere that trap heat near the surface
• A measure of the rate of electron flow past a given point in a circuit; measured in amperes (A).
• Which energy is produced from the sun and can be used for heating or power?
• Which device converts electrical energy into mechanical energy?
• If a device with power 0.8 kW runs for 2 hours, what is the energy in kWh?
• A circuit in which the loads are connected end to end so there is only one path for electrons to flow.
• Which expression correctly represents electrical power using voltage and resistance only?
• In a parallel circuit, what is true about the voltage across each branch?
• Zinc and Copper plates in a cell are called what?
• Which safety device is reset by flipping the switch after an overload?
• Which equation represents Ohm's law for a simple circuit?
• Which formula represents electrical power in terms of voltage and resistance?
• Which term identifies a material through which electrons move easily?
• Which term describes energy produced by wind turning a turbine to generate electricity?
• Which instrument is used to measure the flow of electric charge in a circuit?
• Which term describes a material that does not easily allow the movement of electrons through it?
• If a 1 kW heater runs for 3 hours, how much energy is used in kWh?
• What is a kilowatt-hour (kWh)?
• A device to measure very small current in a circuit (usually in milliamperes - mA).
• What is the purpose of a fuse in an electrical circuit?
• Which statement correctly describes a dry cell?
• Which device contains a thin metal strip that melts if too much current passes through a circuit?
• Which component stores energy in a magnetic field when current flows?
• An electrochemical cell in which the electrolyte is a paste is called a?
• Electricity generated by flowing water
• What term describes connecting an object to a large body, like Earth, to remove an electric charge?
• Which device controls the flow of electrons by opening or closing the circuit?
• In circuit diagrams, a single cell is represented by what feature?
• How does resistor material, length, cross-sectional area, and temperature affect resistance?
• The symbol R in Ohm's Law represents what quantity?
• What term describes the ability of a material to oppose the flow of electric current?
• Which term describes the practice of connecting an object to the Earth to remove an electric charge?
• Which energy is derived from the sun and converted into thermal or electrical energy?
• Which term describes an imbalance of electric charge on the surface of an object?
• In electrical circuits, the hot wire is the one that carries the electrical current and is coated blue.
• If a fuse is rated at 7 A, what does this imply?
• Which object has equal numbers of protons and electrons?
• In a series circuit with two resistors, is the current the same through each resistor?
• If a circuit has a 9 V supply and a 2 Ω resistor, what is the current and approximate power?
• Which term describes a path that allows current to take the path of least resistance but can cause a wire to heat up and catch fire?
• Which process involves the transfer of electrons between two neutral objects when they are rubbed together or come into contact?
• Instrument used to measure voltage across a component.
• Which device is used to measure current in a circuit?
• Which device interrupts current if a fault occurs and can be reset?
• A 10 Ω resistor carries 0.5 A. What is its power?
• Why does adding resistors in series increase total resistance?
• Which term describes the warming of a body of water caused by human activity that harms water quality and aquatic life?
• An electric cell that may only be used once is called a?
• Is any liquid in the cell that conducts an electric current called what?
• If a device rated at 2 kW runs for 1.5 hours, how many kWh are used?
• Which term describes a circuit where loads are connected in a single path for current to follow?
• Which device converts mechanical energy into electrical energy?
• In a parallel circuit, what happens if one branch becomes open?
• Which energy source uses water flow to generate electricity?
• What happens to a particle that loses electrons in a chemical process?
• When the nucleus of an atom divides
• Which term describes the device that provides electrical flow of electrons to a circuit?
• In a series circuit, what is true about the current through components and the voltages across them?
• What term describes a more correct name for static electricity since the charges move rather than stay stationary?
• A flow of electrons in one direction through a circuit is called?
• Which statement best describes direct current?
• What is a short circuit?
• What is electric potential difference and its unit?
• If a 4 Ω resistor has a current of 3 A, what is the voltage across it?
• What unit is commonly used to express energy in household electricity consumption?
• Which energy is generated from steam or hot water produced from underground rocks?
• In a series circuit, what happens to the current if the load resistance increases?
• Which term refers to thermocouples connected in series?
• Two identical resistors R are connected in parallel. What is the equivalent resistance?
• A 60 W lamp operates at 120 V. What is the current through it?
• Which statement correctly describes how resistance changes with cross-sectional area for a given material and temperature?