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PRIME MINISTER’S OFFICE-REGIONALADMINISTRATION AND LOCAL GOVERNMENT

PHYSICS DEPARTMENT

CURRENT ELECTRICITY-TEST 3

TIME 2:30HRS

YEAR 2026

INSTRUCTIONS

1. State Ohm’s law.

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(b) When the battery of two cells is connected between the terminals of

resistor R the Ammeter read o.5ῼ and a Voltmeter reads 2.o V

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(i)Draw an electric circuit from the explanation

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(ii) Calculate the resistance of the resistor R

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(C) Write down the factors affecting the resistance of the resistor.

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2. (a) How does the Voltmeter differ from the Ammeter?

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(b) Draw a closed electric circuit showing proper arrangement of an

ammeter, a voltmeter, a Battery of two cells, a fixed resistor, and a switch.

Show the direction of flow of current.

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c) Calculate the voltage required to drive a current of 2A through a resistor

of value 20Ω.

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3. (a) Define electrostatics.

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(b) Name two types of charges.

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(d) State the basic law of charges.

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4. Explain the following:

(a) If a glass window is polished vigorously, it will attract dust.

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(b) When taking off a polyester shirt on a dry night it will give off

some sparks.

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5. Fig. 7.5 shows two polythene rods; X and Y. X is suspended on a stand

using a cotton thread.

Fig. 7.5

State and explain what would happen in each of the following cases.

(a) X and Y are rubbed with clean dry woollen cloth.

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(b) Y is replaced with a Perspex rod and both are rubbed with a clean

dry woollen cloth.

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6. (a) Describe an experiment to show that a charged body can attract an

uncharged body.

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(b) Using suitable circuit diagram, explain the term parallel and series

connection.

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7. (a) You have been provided with a torch cell, two switches, two torch bulbs

and connecting wires. Draw a possible circuit diagram that would allow

the two bulbs to be switched on independently.

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(b)You have been provided with the following electrical components; two

dry cells, three bulbs, a switch and connecting wires. Draw a circuit

diagram using:

a) two bulbs in series with one cell.

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b) one bulb in series and two bulbs in parallel with one cell.

In each case show the position of the switch for all the bulbs to light at

same time.

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8. (a) Draw a circuit diagram to show how 3 lamps can be connected to a cell

so that 2 lamps are controlled by the same switch while the third lamp has

its own switch.

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(b) Calculate the amount of charge that passes through a point in a circuit

in 3 seconds, if the current in the circuit is 0.5 A.

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9. (a) With the aid of a diagram, describe how conventional current and

electrons flow in an electric circuit.

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(b) What instrument is used to measure electric current? How is it

connected in a circuit?

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(c) Explain why the current in a simple cell decreases rapidly when in use.

Describe how to minimize this decrease in current.

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10.(a) State four differences between e.m.f and p.d

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(b) with the aid of diagram distinguish between closed circuit and open

circuit.

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(c) Explain why an ammeter is connected in series with the component?

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