In the circuit shown below, the potential difference across the circuit is doubled. At the same time, two more identical lamps are added in series. Describe what effect that will have on the current. Show your working.

 

Two $1.5 \mathrm{V}$ cells are connected in parallel across a fixed resistor. Describe what effect this has on the current through the resistor.

When there is a current in a circuit, the electrons move through the metal wires.  Fig drawn below shows a simple circuit in which a cell makes a current flow around the circuit.

Draw an arrow on the circuit to show the direction of electron flow and label it 'electron flow'.

The equation $Q=It$ relates current, charge, and time. Complete the table to show the meaning of the symbols in this equation and give their units (name and symbol).

Write an equation linking the following units: coulomb, ampere and second.

A current of $2.4 \mathrm{A}$ flows in a circuit. State how much charge flows past a point in one second.

A current of $2.4 \mathrm{A}$ flows in a circuit. Calculate the charge that flows in $30 \mathrm{s}$.

An electric motor is supplied with current by a power supply. A charge of $720 C$ passes through the motor each minute. Calculate the current that is flowing.

A battery supplies a current of $1.25 \mathrm{A}$ to a circuit. Calculate how long it will take for $75 \mathrm{C}$ of charge to flow round the circuit.