Advertisements
Advertisements
प्रश्न
State three factors on which the heat produced by an electric current depends. How does it depend on these factors?
Advertisements
उत्तर
The heat produced by an electric current depends on the square of the current, the resistance of the device and the time for which the current is passed through the device, i.e.:
H = I2Rt
APPEARS IN
संबंधित प्रश्न
You can given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?
Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs:
(a) for decorating a hotel building from outside?
An electric bulb is rated as 10 W, 220 V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn is 5 A?
A wire of uniform thickness with a resistance of 27Ω is cut into three equal pieces and they are joined in parallel. Find the equivalent resistance of the parallel combination.
A fuse is a short piece of wire of high ______ and low ______.
Calculate the amount of energy transferred by a 10 A electric current flowing through a resistor of 5 o for 15 minutes.
Name the principle on which a transformer works.
An electric bulb is rated 250 W, 230 V.
- the energy consumed in one hour, and
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply of the energy supplied in kWh to the three heaters in 5 hours.
A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:
The resistance of the bulb
At the time of short circuit, the electric current in the circuit ______.
Answer the following question.
What is the function of a galvanometer in a circuit?
How is direction of current related to the direction of flow of electrons?
State expression for Cells connected in series.
What is the speed of electric current?
Coulomb is the SI unit of ____________.
An ammeter is always placed in parallel with the circuit.
Assertion (A): Electric current will not flow between two charged bodies when connected if their charges are the same.
Reason (R): Current is the rate of flow of charge.
