Page 93 - Physics_Form_2

Current electricity

3. Describe, with the aid of a diagram,
the construction of a typical lead-

acid accumulator.
4. Use appropriate diagrams to illustrate
how an accumulator may be charged
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and discharged.

5. Three cells of e.m.f 1.5 V, 1.6 V,
and 1.3 V are connected in series to
Figure 2.62: A car battery
supply current to an external resistor
2. They are used to provide energy to of 1.6 Ω. The internal resistances of
power domestic appliances such as the three cells are 0.26 Ω, 0.35 Ω and
radio, television and lighting fixtures. 0.42 Ω, respectively. Determine the
3. They are used to store electrical current through an external resistor.
energy produced by solar panels. 6. Four cells each of e.m.f 1.48 V

and internal resistance 0.51 Ω are
Exercise 2.5 connected in parallel across an
1. With the aid of a diagram and external resistor of 2.6 Ω. Determine
chemical equations, describe the the current supplied by the battery.
construction and operation of a 7. Figure 2.63 (a) and (b) show two
simple cell. identical bulbs connected to one cell
2. State the defects of a simple cell and two dry cells respectively. The
and explain how these defects can bulb connected to two dry cells lights
be minimised. up brighter

(a) (b)
Figure 2.63

(a) What is meant by the value “9 V” labelled on the dry cell?
(b) Explain why the bulb connected to two dry cells is brighter.

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Physics Form 2 Final.indd 87 25/10/2025 10:26