V = IR

• V = IR

  potential difference = current x resistance
• A 12 ohms resistor has 2 A of current passing through.

  Potential difference?

  V = IR

  V = 2 x 12

  V = 24 V
• 16 V is supplied across a resistor that has 2 A of current.

  Resistance?

  V = IR

  16 = 2 x R

  R = 16/2

  R = 8
• For wires and resistors, increasing the temperature will increase the resistance.
• Diodes..


  Only allow current to flow one way around a circuit.