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Power, Current and charge
- When an electricity charge flows through a resistor, the resistor gets hot.
- Energy has been transformed from
electrical energy into heat energy
- Power (watts, W) = Energy transferred/transformed (Joules, J)
Time Taken (Seconds, S)
- P=E
T
- P=E
T
- Power (Watts, W) = Current (Amperes, A) x Potential difference (Volts, V)
- P = I x V
- P = I x V
- This heating effect occurs in all types of resistance not just resistors
- therefore the cables themselves and all electrical devices
generate heat depending on their resistance
- therefore the cables themselves and all electrical devices
generate heat depending on their resistance
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