paper 6 physics Flashcards
1
Q
proportionality between resistance and length
A
resistance is directly proportional to the length of a wire . R= K x L
resistance is inversely proportional to the cross-sectional area of a wire
2
Q
ammeter use
A
measures current (amps)
3
Q
voltmeter use
A
measures voltage (voltz)
4
Q
resistance equation
A
R = V / I
resistance=(p.d)/(current)
5
Q
electromotive force (e.m.f)
A
The energy supplied by a source in driving charge around a complete circuit
6
Q
potential difference
A
how much energy there is to drive a current through the wire (volts)
7
Q
current in metals
A
current in metals is due to a flow of electrons
8
Q
A
