2.3 D.C. Circuits

Question 1

The law of conservation of charge

Answer 1

Electric charge cannot be created or destroyed, (though positive and negative charges can neutralise each other). Charge cannot pile up at a point in a circuit.

Question 2

Emf, E

Answer 2

The emf of a source is the energy converted from some other form (e.g. chemical) to electrical potential energy per coulomb of charge flowing through the source. Unit: V

Question 3

V (in V = E - Ir)

Answer 3

The energy supplied per unit charge to the external circuit (from epe to some other form)

Question 4

E (in V = E - Ir)

Answer 4

The total energy converted from chemical energy to electrical potential energy per unit charge passing through the cell

Question 5

Ir (in V = E- Ir)

Answer 5

The energy lost as heat(/internal energy) per unit charge inside the cell