Current Electricity

Potential Difference
1. A.K.A Voltage
2. Volt
3. Scalar quantity
4. V = W/Q
  1. W = work
  2. Q = charge
5. Electromotive force (emf)
  1. A voltage that is applied to a circuit
Capacitance
1. Electrical device that stores electric charge
2. C = εA/d
  1. ε = permittivity
  2. A = common area
  3. d = distance between plates
3. Energy stored in a capacitor
  1. W = (1/2)CV²
4. Capacitors conduct A.C. but not D.C.
Electric current (I)
1. Flow of electric charge
2. Scalar quantity
3. Ampere (A)
4. Q = It
  1. Q = charge
  2. I = current
  3. t = time
5. Ammeter
6. Effects
  1. Chemical
  2. Magnetic
  3. Heating
7. Joule's Law
  1. P = I²R
    1. P = power
    2. I = current
    3. R = resistance
Domestic circuits
1. Plugs
  1. Live wire
  2. Neutral wire
  3. Earth wire
  4. Two-pin plugs
    1. Do not need to be earthed
2. Fuses
  1. Wire that will melt when current above a certain size passes through it
3. Miniature circuit breakers
  1. Prevent electrocution or fire
4. Residual current devices
kilowatt-hour (kWh)
1. Energy (in kWh) = Power (in kW) x time (in h)
2. Amount of energy used by a 1,000 watt appliance in one hour

Resource summary

	Created by alex.examtime9373 over 10 years ago

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