Electrical Circuits 🔌

Question 1

State Kirchhoff’s first law

Answer 1

Charge is conserved therefore the total current into a point = the total current out of that point

Question 2

State Kirchhoff’s second law

Answer 2

Energy is conserved therefore the total sum of p.d.s in a closed loop = the total sum of e.m.f.s in the closed loop

Question 3

Define ‘internal resistance’

Answer 3

The e.m.f supply behaves as if it has an internal resistance causing some energy to be transferred to thermal energy.