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प्रश्न
Write an expression for calculating electrical power in terms of current and resistance.
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उत्तर
Electrical power in terms of current and resistance is P = I2R.
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संबंधित प्रश्न
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
How does the resistance of a wire change when:
its length is tripled?
Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.
State a relation between electrical power, resistance and potential difference in an electrical circuit.
Calculate the equivalent resistance between P and Q from the following diagram:
Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:
