6 d electronics 091210

Electricity 6D: Thursday 9 th December

Experiment ,[object Object],[object Object],r E V A V I the e.m.f. the gradient = - internal resistance

Short circuit current ,[object Object],[object Object]

Purple Book, page 51 ,[object Object]

Wheatstone bridge circuit ,[object Object],V R 3 R 4 R 1 R 2 A B If V OA = V OB there is no p.d. between A and B so no current flows. The potentials at A and B depend on the ratio of the resistors that make up each of the two voltage dividers. The voltmeter forms a ‘bridge’ between the two voltage dividers to make up a bridge circuit. The bridge is said to be balanced when the resistors in the two potential dividers are in the same ratio as each other and voltmeter reads zero: O

Finding an unknown resistance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wheatstone bridge – slightly out of balance ,[object Object],[object Object],Out of balance voltage Out of balance resistance + + - - 0

Purple Book, page 53 ,[object Object]

6 d electronics 091210

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