Question

Umesh has two bulbs having resistances of 15 Ω and 30 Ω. He wants to connect them in a circuit, but if he connects them one at a time the filament gets burnt.
What will be the effective resistance in the above circuit?

Answer 1

Answer:

connect them in parallel

Explanation:

so we get 10 as resistance

Answer 2

Answer:

A ➝ Parallel combination.

B ➝ Characteristics of a potential parallel combination of resistors :

1. The voltage (potential difference) across each of the resistors is the same.
2. The total current is equal to the currents through the individual resistors.
3. The reciprocal of the effective resistance of the combination is equal to the sum of the reciprocals of the individual resistances.
4. The effective resistance of the combination is less than any of the individual resistances.
5. The effective resistance of the combination is less than any of the individual resistances.
6. This combination can be used to decrease the resistance in a circuit.