What is current?

Current (I) is a measure of the flow of electrons around a circuit.

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What are the units for current?

Amperes, amps, or 'A'.

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What is potential difference?

Potential difference (V) is the force driving the flow of electrons around a circuit.

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What is another name for potential difference?

Voltage

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What are the units for potential difference?

Volts, V

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What is resistance?

Resistance (R) is everything that resists or opposes the flow of electrons in a circuit.

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What are the units for resistance?

Ohms (Ω)

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Which way does current (conventional current) flow around a circuit?

Positive terminal ➔ negative terminal.


(this is a bit confusing. Even though electrons travel from the negative terminal to the positive terminal, we say that current travels from the positive terminal to the negative terminal )

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Which component does the above circuit symbol represent?

A cell.

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Which circuit symbol is used to represent an open switch?


Does an open switch allow or prevent current from flowing around a circuit?

An open switch breaks the circuit and so prevents current from flowing.

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Which circuit symbol is used to represent a battery?

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Which circuit symbol is used to represent a filament lamp?

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Which component does the above circuit symbol represent?

A closed switch.


A closed switch completes the circuit, and so allows current to flow.

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