Question

Name an instrument that measures potential difference between two points in a circuit. Define

the unit of potential difference in terms of SI unit of charge and work. Draw the circuit symbols for

a, (i) variable resistor, (ii) a plug key which is closed one.

Two electric circuits I and II are shown below​

Answer 1

$\fbox\blue{A}\fbox\pink{N}\fbox\red{S}\fbox\green{W}\fbox\orange{E}\fbox\purple{R}$

1.) Voltmeter

2.) The S.I Unit of potential difference is volt (V).

1 volt = One volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other.

3.) Answer in the picture

Answer 2

Answer:

Voltmeter measures potential difference between two points in a circuit. V = W Q V=WQ V = Potential difference, W = Work done Q = Quantity of change V = 1 J 1 C = 1 V=1J1C=1 volt. The SI unit of potential different is volt. The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 coulomb of electric charge from one point to the other. Circuit symbols of - (a) varibale resistor (i) Circuit (I) has more resistance as the combined resistance of any number of resistance connected in series is equal to the sun of the individual resistance. (ii) Circuit (II) (iii) In circuit (II) the potential difference across each resistor is equal. (iv) If R 1 > R 2 > R 3 R1>R2>R3 in circuit (I) more heat will be produced in R 1 R1 as compared to other two resistors.