Applied Electricity Mock 2026

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Applied Electricity Mock 2026

Question 1 of 50

The unit of electrical resistance is the

A. ampere B. volt C. ohm D. watt

Question 2 of 50

The unit of electrical power is the

A. joule B. watt C. coulomb D. henry

Question 3 of 50

The unit of capacitance is the

A. henry B. farad C. tesla D. weber

Question 4 of 50

The unit of inductance is the

A. farad B. henry C. ohm D. siemens

Question 5 of 50

A 12 V supply drives a current of 3 A through a resistor. Find the resistance.

A. 0.25 Ω B. 4 Ω C. 15 Ω D. 36 Ω

Question 6 of 50

Three cells of 1.5 V each connected in series give a total e.m.f. of

A. 0.5 V B. 1.5 V C. 3.0 V D. 4.5 V

Question 7 of 50

The frequency of the mains supply in Ghana is

A. 50 Hz B. 60 Hz C. 100 Hz D. 240 Hz

Question 8 of 50

Find the power used by a device drawing 5 A from a 230 V supply.

A. 46 W B. 235 W C. 1,150 W D. 2,300 W

Question 9 of 50

A 100 W bulb is used for 10 hours. How much energy does it use?

A. 0.1 kWh B. 1 kWh C. 10 kWh D. 1,000 kWh

Question 10 of 50

The resistance of a conductor increases when its

A. length decreases B. cross-sectional area decreases C. temperature falls (for metals) D. material is changed to silver

Question 11 of 50

Resistors of 4 Ω and 12 Ω are connected in parallel. Find the equivalent resistance.

A. 3 Ω B. 8 Ω C. 16 Ω D. 48 Ω

Question 12 of 50

Kirchhoff's current law states that at a junction

A. the sum of voltages is zero B. the sum of currents entering equals the sum leaving C. current is always zero D. resistance is constant

Question 13 of 50

Identical cells connected in parallel give

A. a higher voltage B. the same voltage but a longer life C. zero voltage D. a lower current capacity

Question 14 of 50

The part of a d.c. motor that reverses the current in the armature every half turn is the

A. brush B. field coil C. commutator D. yoke

Question 15 of 50

A transformer works only on

A. direct current B. batteries C. static electricity D. alternating current

Question 16 of 50

Kirchhoff's voltage law states that around any closed loop

A. the sum of the e.m.f.s equals the sum of the voltage drops B. current is the same everywhere C. resistance adds up to zero D. power is constant

Question 17 of 50

Fleming's right-hand rule is used to find the direction of

A. force on a conductor in a motor B. current in a resistor C. magnetic field of a solenoid D. induced current in a generator

Question 18 of 50

The law that says an induced current opposes the change producing it is

A. Lenz's law B. Ohm's law C. Coulomb's law D. Faraday's first law of electrolysis

Question 19 of 50

Laminating the core of a transformer reduces

A. eddy current losses B. copper losses C. voltage D. number of turns

Question 20 of 50

A transformer has a primary voltage of 240 V and a secondary voltage of 12 V. If the primary has 2,000 turns, find the secondary turns.

A. 100 B. 200 C. 1,000 D. 40,000

Question 21 of 50

The r.m.s. value of a sinusoidal voltage with a peak value of 100 V is about

A. 50 V B. 100 V C. 70.7 V D. 141 V

Question 22 of 50

In a purely inductive a.c. circuit, the current

A. leads the voltage by 90° B. is zero C. is in phase with the voltage D. lags the voltage by 90°

Question 23 of 50

Power factor in an a.c. circuit is

A. true power ÷ apparent power B. apparent power ÷ true power C. voltage × current D. resistance ÷ current

Question 24 of 50

A device that cuts off supply when it detects current leaking to earth is the

A. MCB only B. switch fuse C. transformer D. RCD (residual current device)

Question 25 of 50

The internal resistance of a cell causes

A. no effect B. the e.m.f. to rise C. the terminal voltage to fall when current flows D. an infinite current

Question 26 of 50

A Wheatstone bridge is used to measure

A. frequency B. current C. power D. an unknown resistance accurately

Question 27 of 50

In a purely inductive circuit, the current

A. lags the voltage by 90° B. leads the voltage by 90° C. is in phase with the voltage D. is zero

Question 28 of 50

Power factor is the ratio of

A. true power to apparent power B. voltage to current C. resistance to reactance D. frequency to period

Question 29 of 50

In a purely inductive circuit, current

A. lags the voltage by 90° B. leads the voltage by 90° C. is in phase with the voltage D. is zero

Question 30 of 50

A wire of resistivity 1.7 × 10⁻⁸ Ω m, length 10 m and area 1 × 10⁻⁶ m² has a resistance of

A. 17 Ω B. 1.7 Ω C. 0.17 Ω D. 0.017 Ω

Question 31 of 50

The speed of a DC shunt motor is fairly

A. zero B. very variable C. constant under varying load D. infinite at no load

Question 32 of 50

The minimum size of cable for a domestic lighting circuit is commonly

A. 1.5 mm² B. 0.5 mm² C. 10 mm² D. 25 mm²

Question 33 of 50

An induction motor is widely used because it is

A. only for DC B. very expensive C. robust and needs little maintenance D. very fragile

Question 34 of 50

Reactive power is measured in

A. volt-amperes reactive (VAR) B. watts C. joules D. ohms

Question 35 of 50

A 13 A fuse is suitable for an appliance of about

A. 3,000 W on 230 V B. 100 W only C. 10,000 W D. 50 W

Question 36 of 50

Capacitive reactance decreases when the

A. frequency increases B. frequency decreases C. capacitance decreases D. voltage decreases

Question 37 of 50

A 6 Ω resistor is in series with a parallel pair of 4 Ω and 12 Ω across 18 V. The total current is

A. 1 A B. 2 A C. 3 A D. 0.82 A

Question 38 of 50

In the same arrangement (6 Ω in series with 4 Ω ∥ 12 Ω across 18 V), the current in the 12 Ω resistor is

A. 2 A B. 1.5 A C. 0.5 A D. 1 A

Question 39 of 50

Maximum power is transferred to a load when the load resistance

A. is twice the internal resistance B. is zero C. is infinite D. equals the internal resistance of the source

Question 40 of 50

Using Thevenin's theorem, a network is replaced by

A. a current source only B. a voltage source in series with a resistance C. a capacitor D. an inductor

Question 41 of 50

A 4-pole AC generator runs at 1,500 rpm. Its output frequency is

A. 100 Hz B. 25 Hz C. 50 Hz D. 60 Hz

Question 42 of 50

The back e.m.f. of a DC motor with supply 240 V, armature resistance 0.5 Ω and current 20 A is

A. 10 V B. 250 V C. 240 V D. 230 V

Question 43 of 50

Hysteresis loss in a transformer core is reduced by using

A. copper B. silicon steel C. aluminium D. solid iron

Question 44 of 50

A circuit draws 10 A at 240 V with a power factor of 0.8. The true power is

A. 1,920 W B. 2,400 W C. 3,000 W D. 1,440 W

Question 45 of 50

Capacitive reactance of a 100 μF capacitor at 50 Hz is about

A. 31.8 Ω B. 3.18 Ω C. 318 Ω D. 0.0318 Ω

Question 46 of 50

Power factor correction in industry is usually done by adding

A. capacitors in parallel B. resistors in series C. inductors in parallel D. fuses

Question 47 of 50

A transistor has β = 100 and base current 20 μA. The collector current is

A. 2 mA B. 0.2 mA C. 20 mA D. 200 μA

Question 48 of 50

A half-wave rectifier fed with 12 V r.m.s. gives a peak output of about

A. 16.3 V (ignoring diode drop) B. 12 V C. 8.5 V D. 24 V

Question 49 of 50

A common-emitter amplifier produces an output that is

A. inverted relative to the input B. in phase C. zero D. DC only

Question 50 of 50

The IEE regulations require the earth loop impedance to be low so that

A. fuses or breakers operate quickly under faults B. lamps glow brighter C. cables cool D. bills reduce

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.