Advertisements
Advertisements
प्रश्न
Two resistances R1 = 4Ω and R2 = 6Ω are connected in series. The combination is connected with a battery of e.m.f. 6V and negligible resistance. Calculate:
(i) the heat produced per minute in each resistor,
(ii) the power supplied by the battery.
Advertisements
उत्तर
Given: R1 = 4Ω, R2 = 6Ω, E = 6V, t = 1 minute = 60s.
Total resistance of the circuit R = R1 + R2 = 4 + 6 = 10Ω
Current through the battery I = `"E"/"R" = 6/10 = 0.6` A
The same current flows through each resistor.
(i) The heat produced in resistor R1 is H1 = I2R1t
= (0.6)2 × 4 × 60 = 86.4 J
The heat produced in resistor R2 is H2 = I2R2t
= (0.6)2 × 6 × 60 = 129.6 J
(ii) The power supplied by the battery = E × I
= 6 × 0.6 = 3.6 W.
संबंधित प्रश्न
Define kilowatt-hour.
In a filament type light bulb, most of the electric power consumed appears as:
(a) visible light
(b) infra-red-rays
(c) ultraviolet rays
(d) fluorescent light
Calculate the current through a 60 W lamp rated for 250 V. If the line voltage falls to 200 V, how is the power consumed by the bulb affected?
Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.
A simple electric circuit has 24 V battery and a resistor of 60 Ω. What will be the current in the circuit? The resistance of the connecting wires is negligible.
Define Kilo watt hour.
Why is heating coil wound in the form of a helix in electric stove?
In an electric radiator or room heater, state with reason, why the porcelain tube wound with a nichrome wire is placed between the pole and principal focus of the parabolic concave reflector.
State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.
Electric power is inversely proportional to ____________.
