Page 53 - Physics_Form_2

Current electricity

2. Connect another bulb, B, in series 5. Connect bulb C in parallel with bulbs
with bulb A as shown in Figure 2.12. A and B as in the circuit shown in
Figure 2.15. Observe how the
3 v
brightness of the bulb’s changes.
Disconnect the circuit.
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3 v

Bulb A Bulb B Bulb A
Figure 2.12
Observe the brightness of the bulbs.
Bulb B

3. Connect another bulb, C, in series
with bulbs, A and B as shown in Bulb C
Figure 2.13. Observe how the
brightness of bulbs A and B changes.

3 v Figure 2.15

Questions
(a) What happened to the brightness of
the bulbs as more bulbs were added
in series?
(b) What happened to the brightness of
Bulb A Bulb B Bulb C
Figure 2.13 the bulbs as more bulbs were added
in parallel?
4. Connect bulb B in parallel with bulb
A as shown in Figure 2.14. Observe The brightness of the bulbs was reduced
the brightness of the bulbs compared as more bulbs were added in series. This
to the initial brightness of bulb, A. is because the total resistance increases
3 v when more bulbs (resistors) are
added in series and consequently, the
potential difference across individual
bulbs is reduced. When bulbs are
Bulb A
connected in parallel, the brightness of
individual bulbs remains the same with
an increase in the number of bulbs in
Bulb B
the circuit. This is because the potential
difference across each bulb remains
Figure 2.14
the same when the number of bulbs

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Physics Form 2 Final.indd 47 25/10/2025 10:25