Four devices P, Q, R and S were tested at two different voltages

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Four devices P, Q, R and S were tested at two different voltages. Their readings are listed below: • P:

(1\,\text{V},\;0.25\,\text{A})

and

(4\,\text{V},\;1.00\,\text{A})

• Q:

(2\,\text{V},\;0.40\,\text{A})

and

(6\,\text{V},\;1.10\,\text{A})

• R:

(1\,\text{V},\;0.30\,\text{A})

and

(4\,\text{V},\;1.60\,\text{A})

• S:

(2\,\text{V},\;0.50\,\text{A})

and

(6\,\text{V},\;1.60\,\text{A})

Which device behaves as an ohmic conductor? (a) Device\;S (b) None\;of\;the\;devices (c) Device\;P (d) Device\;Q