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

Ohm's law states that, at constant temperature, the current through a conductor is

Question 3 of 10

Electric current is the rate of flow of charge.

Question 4 of 10

A current of 1 A flows through a 20 Ω resistor. The p.d. across it is ___ V.

Question 5 of 10

Which device does NOT obey Ohm's law?

Question 6 of 10

A cell of e.m.f. 12 V and internal resistance 1 Ω is connected to a 2 Ω resistor in series with a parallel combination of 6 Ω and 12 Ω resistors. Calculate (a) the effective resistance of the parallel combination, (b) the total external resistance, (c) the current from the cell, (d) the terminal p.d., (e) the current in the 6 Ω resistor.

Question 7 of 10

A current of 3 A flows through a 4 Ω resistor. The p.d. across it is ___ V.

Question 8 of 10

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

Question 9 of 10

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

Question 10 of 10

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