Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
The work done to move a charge of between two points is .
The potential difference is the work done per coulomb: , in volts (). So . An ammeter goes in series; a voltmeter goes in parallel.
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.
Step 1. (a) .
Step 2. (b) .
Answer: (a) . (b) .
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