Energy, Power And Heating Effect Of The Current
Current Electricity of Class 12
ENERGY, POWER AND HEATING EFFECT OF THE CURRENT
When a constant current I flows for time t from a source of emf E, then the amount of charge that flows in time t is Q = It. Electrical energy delivered W = Q.V = VIt
Thus, power given to the circuit = W/t = VI or V2/R or I2R
In the circuit, we can write, E. I = I2R + I2 r,
where EI is the rate at which chemical energy is converted to electrical energy, I2R is power supplied to the external resistance R and I2r is the power dissipated in the internal resistance of the battery.
An electrical current flowing through, a conductor produces heat in it. This is known as Joule's effect. The heat developed in Joules is given by H = I2.R.t, where I = current in Ampere, and R = resistance in ohms, t = time in seconds.
The equation H = I2Rt is also known as Joule’s law of heating.
- Electric Current
- Mechanism Of Current Flow In Metallic Conductors
- Ohm's Law
- Specific Resistance Of The Material Of A Wire
- Measurement Of Unknown Resistance Using A Post Office Box
- Classification Of Materials In Terms Of Conductivity
- Kirchhoff Law
- Grouping Of Resistances
- Grouping Of Identical Cells
- Measuring Instruments
- Verification Of Ohm’s Law Using Voltmeter And Ammeter
- Energy, Power And Heating Effect Of The Current
- solved question
- Exercise 1
- Exercise 2