DC circuits Flashcards
1
Q
internal resistance
A
resistance between the terminals of power supplies
2
Q
terminal potential difference
A
p.d. between the terminals of a cell or power supply when current is being delivered
3
Q
when does a battery deliver maximum power?
A
when the load resistance of the circuit is equal to the internal resistance of the battery
4
Q
kirshhoff’s first law
A
the sum of currents entering a junction in a circuit is always equal to the sum of the currents leaving the junction
5
Q
kirshhoff’s second law
A
the sum of electromotive forces in a closed circuit is equal to the sum of the potential difference
6
Q
balance point
A
position of the sliding contact on the wire
7
Q
use of a centre-zero galvanometer
A
detect current though a cell
