Resistance and I-V Characteristics

Question 1

What is the resistance of ohmic conductors?

Answer 1

The resistance of ohmic conductors does not change with the current

Examples include wires and resistors.

Question 2

What relationship does the current have with potential difference in ohmic conductors?

Answer 2

The current is directly proportional to the potential difference across it at a constant temperature

This relationship is described by Ohm’s Law: V = IR.

Question 3

What happens to the resistance of non-ohmic components when current changes?

Answer 3

The resistance of non-ohmic components changes with the current

Examples include diodes and filament lamps.

Question 4

How does a filament lamp behave when electrical charge flows through it?

Answer 4

It transforms some energy to the thermal energy store of the filament, which heats up

This heating causes the resistance to increase.

Question 5

What effect does temperature have on the resistance of a filament lamp?

Answer 5

Resistance increases with temperature

As the filament heats up due to increased current, its resistance rises.

Question 6

How does the resistance of a diode change based on current direction?

Answer 6

The resistance depends on the direction of the current; it allows current to flow in one direction and has high resistance in the reverse direction

This property is fundamental to the operation of diodes.

Question 7

Fill in the blank: The formula that relates voltage, current, and resistance is _______.

Answer 7

V = IR