Topic 2 - Electricity

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What is the definition of electrical current (I)?
The flow of electrons
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Which unit is used to measure current?
Amps, A
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What is the definition of voltage/potential difference (V)?
The driving force of a current
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What is the definition of resistance?
Anything that slows the flow of a current down.
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The greater the resistance across a component, the ____ the current that flows
Smaller
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What is measured using the Ohms unit?
Resistance
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What is the equation for voltage?
V = I x R
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What is a light dependent resistor?
A resistor that is dependent on light intensity (resistance falls in bright light)
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What is a thermistor?
A resistor that is dependent on temperature (resistance drops in hot conditions)
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Is potential difference shared in a series circuit?
Yes
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Is current the same in a series circuit?
Yes
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Does resistance add up in a series circuit?
Yes
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AC is...
Mains supply
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DC is...
Battery supply
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The live wire is...
brown (provides alternating potential difference)
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The neutral wire is...
blue (completes the circuit)
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The earth wire is...
green/yellow (protects the wiring)
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Equation for energy
Energy (J) = Power (W) x Time (s)
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Other cards in this set

Card 2

Front

Which unit is used to measure current?

Back

Amps, A

Card 3

Front

What is the definition of voltage/potential difference (V)?

Back

Preview of the front of card 3

Card 4

Front

What is the definition of resistance?

Back

Preview of the front of card 4

Card 5

Front

The greater the resistance across a component, the ____ the current that flows

Back

Preview of the front of card 5
View more cards

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