DC circuits

Question 1

internal resistance

Answer 1

resistance between the terminals of power supplies

Question 2

terminal potential difference

Answer 2

p.d. between the terminals of a cell or power supply when current is being delivered

Question 3

when does a battery deliver maximum power?

Answer 3

when the load resistance of the circuit is equal to the internal resistance of the battery

Question 4

kirshhoff’s first law

Answer 4

the sum of currents entering a junction in a circuit is always equal to the sum of the currents leaving the junction

Question 5

kirshhoff’s second law

Answer 5

the sum of electromotive forces in a closed circuit is equal to the sum of the potential difference

Question 6

balance point

Answer 6

position of the sliding contact on the wire

Question 7

use of a centre-zero galvanometer

Answer 7

detect current though a cell