Electricity
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Alternating Current | Current that alternates or changes direction. Mains electricity does this 50 times a second (50Hz)
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| Ammeter | Measures the size of the current travelling through a circuit
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| Battery | Two or more cells joined together
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| Cell | Component that converts chemical potential energy into electrical energy
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| Circuit | Continuous pathway through which electrons can flow
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| Conductor | A substance whose electrons can travel freely (e.g. metals)
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| Conventional current | The flow of current from positive to negative around a circuit
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| Current | Flow of electrons around a circuit measure in amps (A)
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| Diode | Component which only lets current travel in one direction
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| Direct current | Current that only flows in one direction. Batteries produce d.c
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| Electricity | Movement of electrons through a conductor
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| Electron flow | The flow of negative charges from negative to positive around a circuit.
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| Fuse | Thin wire which melts or "blows" and breaks a circuit if the current is too large.
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| Insulator | A substance that does not conduct electricity (e.g. air, rubber)
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| Lamp | Component that transforms electrical energy into light energy (and heat)
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| Ohmic component | A component that obeys Ohm's Law: the current through it increase proportionately with the voltage across it. The resistance stays constant.
Components are non-ohmic if the temperature increases at this increased resistance.
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| Parallel circuit | A circuit where the current divides and passes through different loops or branches. The voltage is the same across branches.
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| Resistance | A measure of how difficult it is for current to flow around a circuit or through a component. Measured in ohms (Ω)
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| Resistor | A component that restricts the flow of current. Fixed-value resistors do not change their resistance but with variable resistors (rheostats) you can change the resistance
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| Series circuit | A circuit composed of a single loop (only one path for the current to flow). The current is the same everywhere but the voltage is shared between components.
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| Switch | Component which allows current to flow when it is closed
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| Voltage | The difference in electrical energy between two points that make a current flow, measured in volts (V). Also called potential difference.
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| Voltmeter | Measures the change in voltage as it passes through a component.
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| Wire | Conductor which passes electricity easily from one part of a circuit to another.
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To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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