Question

Draw a circuit diagram where two bulbs are connected in series while a
third bulb is connected parallel to the first two bulbs.


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Answer 1

Answer:

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Explanation:

(i) Bulbs in parallel provide more illumination. This is because(a) each bulb gets same voltage and is equal to the applied voltage.

(b) each bulb draws required current from the mains. Hence, they work properly.

(ii)When one bulb in each circuit get fused, In series: Rest of the bulbs will not glow. This is because in series arrangement, there is only a single path for the flow of current. In parallel: Rest of the bulbs will continue to glow as in parallel connection,

(a) individual branch in the circuit completes its own circuit, or

(b) different paths are available for the flow of current.

(iii) Circuit diagram

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Answer 2

The circuit shown below has two 3 bulbs, 2 keys and a battery.

Explanation:

An electrical circuit is a closed path that includes all the components connected to complete the flow of current.

The circuit consists of:

1. Three bulbs where two bulbs B and C are connected in series and bulb A is connected in parallel with the series connection of B and C.
2. A battery which acts as a source of Direct current. Direct current provides uni-directional current.
3. Two plug keys, plug key is a switch which has to be closed so that the circuit completes and current is allowed to flow.
4. Both the plug keys P and Q must be closed for all three bulbs to glow.
5. When plug key P is closed but Q is open, then bulb A is not supplied with current and it does not glow, only bulb B and C glows.
6. When plug P is open, none of the bulbs glow because the path of current is obstructed.
7. Current flow is shown which is conventionally considered to be opposite of charge flow.