Kuulchat - Senior High School (S.H.S) Science Electrical energy Practice Test Questions

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ELECTRICAL ENERGY

1.

An electric bulb is rated 120 W and 240 V. Determine the current it draws from the mains.

A.

0.5 A

B.

0.6 A

C.

1.0 A

D.

2.0 A

Electric Power

Power (P) = Current (I) x Voltage (V)

Power = 120 W
Voltage = 240 V

120 = I x 240

Divide both sides by 240

I = $\frac{120}{240}$ = 0.5 A

2.

Two resistors each 5 Ω are connected in parallel. Determine their effective resistance.

A.

2.5 Ω

B.

6.4 Ω

C.

10.0 Ω

D.

25.0 Ω

Resistance in parallel

$\frac{1}{R_{total}}$ = $\frac{1}{R_{1}}$ + $\frac{1}{R_{2}}$ + $\frac{1}{R_{3}}$ + ... $\frac{1}{R_{n}}$

$\frac{1}{R_{total}}$ = $\frac{1}{5}$ + $\frac{1}{5}$

$\frac{1}{R_{total}}$ = $\frac{1 x 1 + 1 x 1}{5}$

$\frac{1}{R_{total}}$ = $\frac{1 + 1}{5}$

$\frac{1}{R_{total}}$ = $\frac{2}{5}$

Cross multiply

R_total x 2 = 1 x 5

Divide both sides by 2

R_total = $\frac{5}{2}$ = 2.5 Ω

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ELECTRICAL ENERGY

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