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प्रश्न
Write an expression for the electrical power spent in flow of current through a conductor in terms of resistance and potential difference.
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उत्तर
Electrical Power , P = `"V"^2/"R"`
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संबंधित प्रश्न
A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.

Find:
- Current in the circuit.
- The terminal voltage of the cell.
- The potential difference across 6Ω Resistor.
- Electrical energy spent per minute in the 4Ω resistor.
Which device is used to measure p.d?
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
A current of 200 mA flows through a 4 kΩ resistor. What is the p.d. across the resistor?
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.

Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation `1/"R" = 1/"r"_1 + 1/"r"_2 + 1/"r"_3`, when joined in parallel.
A current of 0.2 A flows through a conducting wire for 5 minutes. How much charge will flow?
Find out the following in the electric circuit given in Figure
- Effective resistance of two 8 Ω resistors in the combination
- Current flowing through 4 Ω resistor
- Potential difference across 4 Ω resistance
- Power dissipated in 4 Ω resistor
- Difference in ammeter readings, if any.

The SI unit of potential difference is ______.
Name a device that helps to maintain a potential difference across conductors.
