Topic 4.3: Electrical circuits

Question 1

Kirchhoff’s second law

Answer 1

for any path of a circuit , the sum of all the potential difference must equal to total emf of the circuit

Question 2

internal resistance

Answer 2

the resistance within a power source due to the materials and components which make it up

Question 3

what are lost volts ?

Answer 3

lost volts refer to the difference in voltage between that supplied by the source and the amount available to the circuit
they are lost due to the internal resistance the source

Question 4

what is the purpose of a potential divider ?

Answer 4

to provide variable potential difference , or to provide a constant specific p.d

Question 5

how can a potential divider be used as a circuit ?

Answer 5

put a resister that varies with the desired conditions (e.g. thermistor) in the potential divider