Current electricity: Ohm's law and resistors

Question 1 of 10

A current of 3 A flows through a 10 Ω resistor. The p.d. across it is ___ V.

Question 2 of 10

A p.d. of 240 V is applied across a 6 Ω resistor. Find the current.

A. 1,440 A B. 0.025 A C. 40 A D. 246 A

Question 3 of 10

Find the total resistance of 4 Ω, 10 Ω and 8 Ω in series.

A. 2.11 Ω B. 320 Ω C. 14 Ω D. 22 Ω

Question 4 of 10

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

A. 16 Ω B. 8 Ω C. 3 Ω D. 48 Ω

Question 5 of 10

Which device does NOT obey Ohm's law?

A. a metal wire at constant temperature B. a standard resistor C. a semiconductor diode D. a constantan wire

Question 6 of 10

A current of 0.5 A flows through a 20 Ω resistor. The p.d. across it is ___ V.

Question 7 of 10

Find the total resistance of 4 Ω, 6 Ω and 1 Ω in series.

A. 0.71 Ω B. 11 Ω C. 24 Ω D. 10 Ω

Question 8 of 10

The Wheatstone bridge is used to

A. measure current B. measure power C. step up voltage D. measure an unknown resistance

Question 9 of 10

The e.m.f. of a cell is

A. the current it supplies B. its internal resistance C. the p.d. across the load only D. the total energy given to each coulomb of charge

Question 10 of 10

The e.m.f. of a cell is always smaller than its terminal p.d. when current flows.

A. True B. False

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

Past questions, worked solutions and curriculum-mapped study material for JHS and SHS students and teachers in Ghana.

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