DC Circuits

Question 1

An ideal voltmeter has _________

Answer 1

infinitely high resistance so that it does not take any current from the circuit

Question 2

An ideal ammeter has _________

Answer 2

zero resistance so that it does not change the current in the circuit

Question 3

What is the equivalent resistance in series

Answer 3

It is the sum of all the individual resistances

Question 4

What is the equivalent resistance in parallel

Answer 4

The reciprocal of the equivalent resistance of resistors in parallel is the sum of the reciprocals of all the individual resistances

For 2 resistors in R=(product of 2 resistance)/(sum of 2 resistance)

Question 5

What is the potential divider equation

Answer 5

Vout = (R2/(R1+R2))Vin

Question 6

Relationship between V and L in a potentiometer

Answer 6

V = (L/(total length of potentiometer wire))(Vcell)

Question 7

Comparison of e.m.fs using potentiometer

Answer 7

E1/E2 = l1/l2

Question 8

Comparison of resistance using potentiometer

Answer 8

R1/R2 = l1/l2