Question
Diagram 1 shows a resistor connected in a circuit. Diagram 2 shows an identical resistor connected in parallel with the first one.
What is the combined resistance of the two resistors?
greater than in the circuit of diagram 1
less than in the circuit of diagram 1
the same as in the circuit of diagram 1
zero
Answer/Explanation
Ans: B
Question
The current in a lamp connected on its own to the mains supply is 0.60 A. A table decoration has three of these lamps connected in parallel.
Which rating of fuse is suitable to protect this circuit?
A 0.2 A
B 0.6 A
C 1.0 A
D 5.0 A
Answer/Explanation
Ans: D
Question
The diagrams show different resistor arrangements.
Which arrangement has the smallest combined resistance?
Answer/Explanation
Ans: A
Question
Lamps in a circuit are connected in parallel.
What is the advantage of this?
If one lamp breaks, the others remain lit.
Less current is taken from the power supply.
The lamps use less power than if they were connected in series.
The potential difference across each lamp is less than that of the power supply.
Answer/Explanation
Ans: A
Question
In the circuits shown, each of the resistors has a resistance of 1.0 Ω. Which circuit has the greatest resistance?
Answer/Explanation
Ans: C