Advertisements
Advertisements
Question
Write an expression for the electrical power spent in flow of current through a conductor in terms of current and resistance.
Advertisements
Solution
Electrical Power, P = I2R
APPEARS IN
RELATED QUESTIONS
Ohm's law state a relation between potential difference and ___________.
In the circuit shown below:
The potential difference across the 3 Ω resistor is:
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
In the figure given below, A, B and C are three ammeters. The ammeter B reads 0.5A. (All the ammeters have negligible resistance.)
Calculate:
(i) the readings in the ammeters A and C.
(ii) the total resistance of the circuit.
An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.
A 10 m long wire of a particular material is of reistance 5Ω What will be the resistance of 5m long wire of same material and the same thickness.
A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5 Ω when connected to a 10 V battery. Calculate the resistance of the electric lamp.
Now if a resistance of 10 Ω is connected in parallel with this series combination, what change (if any) in current flowing through 5 Ω conductor and potential difference across the lamp will take place? Give reason.
The SI unit of potential difference is ______.
Twenty-seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
What does the positive and negative sign of potential convey?
