GCSE Physics - V = IR Equation & Current/Potential Difference Graphs #15

The video tutorial explains Ohm's Law (V=IR), its importance in electricity, and how to calculate voltage and resistance in circuits. It discusses the relationship between voltage, current, and resistance, emphasizing that as voltage increases, current increases proportionally if resistance remains constant. The tutorial also covers graphing current versus potential difference, the effects of temperature on resistance, and the behavior of filament lamps and diodes in circuits.

What is the voltage across a circuit with a current of 4 amps and a resistance of 2 ohms?

• 10 volts

• 8 volts

• 6 volts

• 12 volts

If the resistance in a circuit remains constant, what happens to the current when the voltage is increased?

• The current becomes zero

• The current increases

• The current remains the same

• The current decreases

How does a larger resistor affect the graph of current versus potential difference?

• The line becomes steeper

• The line becomes less steep

• The line becomes horizontal

• The line becomes a curve

What happens to the resistance of a filament lamp as the current increases?

• The resistance increases

• The resistance remains constant

• The resistance becomes zero

• The resistance decreases

Why do diodes only allow current to flow in one direction?

• They have a low resistance in both directions

• They have a high resistance in the forward direction

• They have a high resistance in the reverse direction

• They have no resistance at all