# Physics- Electricity

### Description

physics gcse
Mind Map by Francesca Weiner, updated more than 1 year ago
 Created by Francesca Weiner over 6 years ago
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## Resource summary

Physics- Electricity
1. Resistance
1. Whatever opposes the flow of charge. Measured in ohms
1. Resistance+ Current around circuit -
1. Length of wire- longer wire means more resistance
1. thickness- thicker wire means more resistance
1. Material
2. Potential Difference
1. Sometimes called voltage, as it is measured in Volts (V) ,with a voltmeter
1. The p.d across a cell is called the electromotive force (emf). It tells us how strong a cell is.
1. P.d Problems
1. Sum of p.d across a cell in series must equal sum of p.d across other components in the loop
1. V1=V2+V3
2. Sum of p.d in branch of parallel circuit equals sum of p.d across any other parallel branch
1. V1=V2=V3

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