Electric Circuit and Circuit Diagram

Q.

Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.

Q.

Write symbols and state functions of each of the following components in an electric circuit:

(i) key, (ii) cell, (iii) rheostat, (iv) ammeter, and (v) voltmeter.

Q.

Which of the following is the symbol of a rheostat?

1. 

2. 

3. 

4. 

   or

   

Q.

What is the function of a key (or switch) in an electric circuit ?

Q.

(a) Complete the circuit given in Fig. 9.17 by inserting between the terminals A and C, an ammeter. (b) In the diagram mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit.

Q.

In the electric circuit shown in Fig.9.16, label the parts A, B, C, D, E, and F. State the function of each part. Show in the diagram the direction of flow of current.

Q.

Write the condition required for a circuit to be a closed circuit.

Q.

Draw the symbol of the rheostat, voltmeter, and electric bulb.

Q. Select the incorrect option.
The options below show the symbols for electrical circuit elements.

1. i) - Voltmeter
2. ii) - Switch
3. iii) - Ammeter
4. iv) - Battery

Q.

A cell is used to :

(a) measure current in a circuit

(b) provide current in a circuit

(c) limit current in a circuit

(d) prevent current in a circuit

Q. Show how you would connect three bulbs, each of resistance 6 $\Omega$, so that the combination has a resistance of

(i) 9 $\Omega$

(ii) 4 $\Omega$

Q.

Which of the following options will give a total potential of 10 volts if each of the individual battery is 2.5 V ?

1. 

2. 

3. 

4. 

Q.

Use the following information to answer the next question.

Two simple electric circuits are shown in the given figure.

Direction of the current flowing through a wire segment can be shown as for current from O to O.

Which wire segment is not paired with the arrow head showing the direction of current flowing through it?

1. 

2. 

3. 

4. 

Q.

What is the function of a key (or switch) in an electric circuit?

1. To control the rate of current flowing through the circuit.

2. To put off current in a circuit.

3. To put on current in a circuit

4. To put on or off current in a circuit

Q.

The symbol used for angstrom is

1. A

2. K

3. $\stackrel{o}{A}$

4. M

Q. (i) In fig. find the potential difference between point A and B.
(ii) Now we wish to measure this potential difference by using a voltmeter of resistance $2k\Omega$. Find the reding of the voltmeter and percentage error.
(iii) solve part (ii) if the voltmeter were of resistance $20k\Omega$.
What conclusion do you draw from the results you get in the above parts?

Q. How the small bulbs, which are used for decoration purpose, are connected?

1. in parallel
2. in series
3. in mixed order
4. all of the above

Q. In fair weather, there is an electric field at the surface of the Earth, pointing down into the ground. What is the sign of the electric charge on the ground in this situation?