# Current Electricity

Mind Map by tatemae.honne, updated more than 1 year ago More Less
 Created by alex.examtime9373 about 6 years ago Copied by tatemae.honne about 6 years ago
900
5

### Description

This mind map outlines the main topics in current electricity. These include potential difference, capacitance, electric currents and domestic circuits. It is aimed at a leaving certificate student or someone who has an interest in learning more about current electricity.

## Resource summary

Current Electricity
1 Potential Difference
1.1 A.K.A Voltage
1.2 Volt
1.3 Scalar quantity
1.4 V = W/Q
1.4.1 W = work
1.4.2 Q = charge
1.5 Electromotive force (emf)
1.5.1 A voltage that is applied to a circuit
2 Capacitance
2.1 Electrical device that stores electric charge
2.2 C = εA/d
2.2.1 ε = permittivity
2.2.2 A = common area
2.2.3 d = distance between plates
2.3 Energy stored in a capacitor
2.3.1 W = (1/2)CV²
2.4 Capacitors conduct A.C. but not D.C.
3 Electric current (I)
3.1 Flow of electric charge
3.2 Scalar quantity
3.3 Ampere (A)
3.4 Q = It
3.4.1 Q = charge
3.4.2 I = current
3.4.3 t = time
3.5 Ammeter
3.6 Effects
3.6.1 Chemical
3.6.2 Magnetic
3.6.3 Heating
3.7 Joule's Law
3.7.1 P = I²R
3.7.1.1 P = power
3.7.1.2 I = current
3.7.1.3 R = resistance
4 Domestic circuits
4.1 Plugs
4.1.1 Live wire
4.1.2 Neutral wire
4.1.3 Earth wire
4.1.4 Two-pin plugs
4.1.4.1 Do not need to be earthed
4.2 Fuses
4.2.1 Wire that will melt when current above a certain size passes through it
4.3 Miniature circuit breakers
4.3.1 Prevent electrocution or fire
4.4 Residual current devices
5 kilowatt-hour (kWh)
5.1 Energy (in kWh) = Power (in kW) x time (in h)
5.2 Amount of energy used by a 1,000 watt appliance in one hour

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