Should an ammeter have a low or high resistance? Why? Should a voltmeter have a low or high resistance? Why? You are marooned on a desert island full of all kinds of standard electrical apparatus...

Should an ammeter have a low or high resistance? Why? Should a voltmeter have a low or high resistance? Why?

You are marooned on a desert island full of all kinds of standard electrical apparatus including a sensitive voltmeter, but

you don't have an ammeter. Explain how you could use the voltmeter to measure currents.