Physics Practice Tests – Current Electricity and Electric Charges

A wire of resistivity 4.40 x 10^-5 Ω cm has a cross sectional area of 7.50 x 10^-4  cm^-2. Calculate the length of this wire that will be required to make a 4.0 Ω resistor.

A. 82.50 cm   B. 68.18 cm    C. 15.90 cm    D. 11.94 cm

Two capacitors of capacitance 0.4 μF and 0.5 μF are connected in parallel and charged to a p.d. of 50V. Determine the total charge acquired.

The equivalent capacitance of a 3μF capacitor and a 6 μF capacitor connected in parallel is ______

A. 2.0 μF     B. 3.0 μF     C. 4.5 μF     D. 9.0μF

Find the cost of running a 60 W lamp for 24 hours, if 1 kWhr costs 5 naira.

The quantity of electric charge stored in a capacitor is measured in ______

A. farad    B. ampere    C. coulomb    D. volt