What is mean by electromotive force (e.m.f.)?
Electromotive force (e.m.f.) is the electrical work done by a source in moving a unit charge around a complete circuit.
what is the unit of e.m.f. measured?
e.m.f. is measured in volts (V).
What does potential difference (p.d.) mean?
Potential difference (p.d.) is the work done by a unit charge passing through a component.
What is the difference between analogue and digital voltmeters?
Analogue voltmeters show measurements using a needle on a scale, while digital voltmeters display the measurement numerically.
What is the equation used to calculate electromotive force (e.m.f.)?
The equation for e.m.f. is E= Q / W , where E is the e.m.f., W is the work done, and Q is the charge.
If the work done is 20 Joules and the charge is 5 Coulombs, what is the e.m.f.?
4V
What is the equation for resistance?
R = V / I
If the voltage is 12V and the current is 3A, what is the resistance?
4Ω
How does the resistance of a metallic wire change when its length is increased?
The resistance increases as the length of the wire increases.
How does the resistance of a metallic wire change when its cross-sectional area is increased?
The resistance decreases as the cross-sectional area increases.
What is the equation for electrical power?
P=I×V
