A 1.5 V cell sends a charge of 5 C round a circuit in 4 s…

Contributed by StemPy Lab

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A $1.5\ \text{V}$ cell sends a charge of $5\ \text{C}$ round a circuit in $4\ \text{s}$ . How much energy does the cell give to the charge, and what is the current?

Need a reminder? The key ideaShow

The potential difference is the work done per coulomb: $V = \dfrac{W}{Q}$ , in volts ( $1\ \text{V} = 1\ \text{J/C}$ ). So $W = VQ$ . An ammeter goes in series; a voltmeter goes in parallel.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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