D.C. circuit

Question 1

Define effective resistance

Answer 1

The combined resistance of all resistors in a circuit. It depends on how the resistors are connected in the circuit, either in series or in parallel or various combination of both

Question 2

Define bypass

Answer 2

Alternative pass of zero resistance for current to flow

Question 3

Define short circuit

Answer 3

Unintentional bypass in circuit resulting in very large current which can generate enough heat to start a fire.

Question 4

Define light-dependent resistor

Answer 4

Resistor which resistance varies with the intensity of light falling on it

Question 5

As the brightness surroundings decreases, resistance of LDR __

Answer 5

increases

Question 6

As temperature of surroundings increases, resistance of thermistor _

Answer 6

decreases

Question 7

Define potentiometer

Answer 7

Variable resistor that is connected at three terminals

Question 8

Formula for Vout in potentiometer

Answer 8

Vout = R(AC)/R(AB) * e.m.f

Question 9

Formula for current in parallel

Answer 9

Total current * Er(total)/ Er(branch)