The I-V graph of an ohmic resistor at constant temperature is:

A straight line through the origin

The I-V graph of a filament lamp curves because:

The filament heats up and its resistance increases

It needs a changing magnetic field to induce a voltage

16questions. Pick an answer and you'll see why right away.

Electric current is the rate of flow of:
A current of 3.0 A flows for 20 s. How much charge passes?
Ohm's law is written as:
A resistor has 8.0 V across it and 0.40 A through it. What is its resistance?
In a series circuit, the current is:
In a parallel circuit, the potential difference across each branch is:
The I-V graph of an ohmic resistor at constant temperature is:
The I-V graph of a filament lamp curves because:
Which component allows current to flow in one direction only?
The UK mains supply is approximately:
What colour is the live wire in a UK plug?
A 1150 W appliance runs at 230 V. What current does it draw?
Which rule gives the direction of the force on a current-carrying wire in a magnetic field?
Which of these increases the strength of an electromagnet?
A transformer has 500 primary turns and 100 secondary turns. The primary voltage is 250 V. The secondary voltage is:
Why must a transformer use alternating current?