IGCSE Physics (0625) Paper 2 -Unit 4. Electricity and magnetism-4.3.2 Series and parallel circuits

The circuit diagram shows a cell connected in series to a resistor and a component $\mathrm{X}$

What is component $X$ ?
A bell
B diode
C heater
D thermistor

Answer/Explanation

Ans:B

A resistor R is connected in parallel with an 8.0 $\Omega$ resistor. The resistance of this combination is 4.0 $\Omega$ .

What is the resistance of resistor R?

A 0.50 $\Omega$

B 2.0 $\Omega$

C 4.0 $\Omega$

D 8.0 $\Omega$

Answer/Explanation

Ans: D

Two 10 $\Omega$ resistors are connected in series and then in parallel.

What is the combined resistance in each case?

	resistance in series / $\Omega$	resistance in parallel / $\Omega$
A	10	5
B	10	10
C	20	5
D	20	10

Answer/Explanation

Ans: C

The reading on the ammeter in the circuit is 1.0 A.

A second ammeter is connected in the circuit. It also reads 1.0 A.

At which labelled point is it connected?

Answer/Explanation

Ans: D

Which labelled component in the circuit shown controls the brightness of lamp X?

Answer/Explanation

Ans: B