Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A student determines the resistance of a length of nichrome wire by using a circuit that includes an ammeter, a voltmeter and a cell.
(a(i))[1]

Define the term resistance.

(a(ii))[2]

Draw a circuit diagram to show the required connections between the components. Use the resistor symbol to stand for the nichrome wire.

(b(i))[1]

Show that the resistance of the wire is $5.00\,\Omega$.

(b(ii))[3]

Calculate, to three significant figures, the resistivity $\rho$ of the nichrome.

(b(iii))[2]

Calculate the percentage uncertainty in $\rho$.

(b(iv))[1]

Determine the absolute uncertainty in $\rho$.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: Potential difference divided by current

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