IB Physics-B.5 Electricity-Paper2-Qc#12-Resistor R and a non-ohmic component T.

The graph shows how current I varies with potential difference V for a resistor R and a non-ohmic component T.
a. The graph shows how current I varies with potential difference V for a resistor R and a non-ohmic component T.
(i) State how the resistance of T varies with the current going through T.
(ii) Deduce, without a numerical calculation, whether R or T has the greater
resistance at I=0.40 A.
Components R and T are placed in a circuit. Both meters are ideal.
Slider Z of the potentiometer is moved from Y to X.
(i) State what happens to the magnitude of the current in the ammeter.
(ii) Estimate, with an explanation, the voltmeter reading when the ammeter reads 0.20 A.
Topic 5 Electricity and magnetism playlist: