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What do the following symbols mean in circuit diagrams?
Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch the third bulb has its own switch.
Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.
- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
In an electric circuit, a battery and a bulb have been connected and the battery consists of two cells of equal potential difference. If the bulb is not glowing, then which tests will you perform in order to find out the reason for the bulb not glowing?
Explain the following:
Closed circuit
State whether true or false. If false, correct the statement.
Ammeter is connected in parallel in any electric circuit.
Choose the statement which is not correct in the case of an electric fuse.
Name the device used these days in place of electric fuses in electrical circuits.
Observe the circuit given:
1. Would any of the bulbs glow when the switch is in the ‘OFF’ position?
2. What will be the order in which the bulbs A, B, and C will glow when the switch is moved to the ‘ON’ position?
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
