Electricity and Circuits

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Equation linking resistance, potential difference and current.
Potential difference = Current x Resistance
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Equation linking potential difference, energy transferred and charge moved.
Energy transferred = Charge moved x potential difference.
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Equation for current.
Current = Charge/Time
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Equation for power if potential difference is unknown.
Power = Current^2 x Resistance
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Equation linking power, potential difference and current.
Power = Potential difference x current
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Equation for power that includes energy transfer.
Power = Energy tranfer/ time
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Equation for energy transferred linking current, potential difference and time.
Energy transferred = Current x Potential Difference x Time
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What is a.c.?
Alternating current. A current that moves in both directions.
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What is d.c.?
Direct current. A current that flows only in one direction.
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Which wire is the neutral wire, what is its potential difference and what does it do?
The neutral wire is BLUE and its potential difference is 0V. The current leaves the appliance through this wire.
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Which wire is the earth wire, what is its potential difference and what does it do?
The earth wire is YELLOW and GREEN. Its potential difference is 0V. And it a safety measurement used to prevent an electric shock or fire from taking place if the live wire get loose.
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Which wire is the live wire, what is its potential difference and what does it do?
The live wire is the BROWN wire. Its potential diifference is 230V and current flows in through this wire to the appliance.
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Mains. Type of power supply? Potential difference? Current?
a.c power supply. Potential difference of 230V. Current of 50 Hz.
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What is ohm's law?
If resistance is constant, then potential difference and current are directly proportional.
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What is potential difference?
The driving force that pushes charge around.
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What is current?
The flow of electric charge.
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What is resistance?
Anything that slows down current.
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Other cards in this set

Card 2

Front

Equation linking potential difference, energy transferred and charge moved.

Back

Energy transferred = Charge moved x potential difference.

Card 3

Front

Equation for current.

Back

Preview of the front of card 3

Card 4

Front

Equation for power if potential difference is unknown.

Back

Preview of the front of card 4

Card 5

Front

Equation linking power, potential difference and current.

Back

Preview of the front of card 5
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