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Heat And Power Developed In A Resistor - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main
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A cell of emf 6V and internal resistance $1 \Omega$ is connected $2 \Omega$ across. The power dissipated in $2 \Omega$ in watts is
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Heat and power developed in a resistor
- Heat and Power developed in a resistor
Heat developed in a resistor: When a steady current flows through a resistance R for time $t$, the loss in electric potential energy appears as increased thermal energy(Heat H) of resistor and $H=i^2 R t$
The power developed $=\frac{\text { energy }}{\text { time }}=i^2 R=i R=\frac{V^2}{R} \quad$ (from Ohm's law)
Unit of heat is the joule (J)
Unit of power is watt (W)
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