Electromotive force

Question 1

What is EMF?

Answer 1

• Electromotive force
• The amount of chemical energy converted to electrical energy per coulomb of charge when passing through a power supply

Question 2

What is the terminal PD

Answer 2

• The potential difference across the terminals of a cell
• If there was no internal resistance, the terminal PD would be the same as the EMF

Question 3

Why is terminal PD less than EMF

Answer 3

• As a cell always has internal resistance

Question 4

What is internal resistance

Answer 4

• The resistance of the materials within the battery

Question 5

What does internal resistance cause?

Answer 5

• Internal resistance causes loss of energy in the power supply over time