Advertisements
Advertisements
Question
Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.
Advertisements
Solution
Given:
Charge (Q) = 96000 C,
Time (t) = 2h,
Potential difference (V) = 40V
The heat generated,
H = VIt
= `"V" xx "Q"/"t" xx "t"`
= V × Q
= 40 × 96000
= 3840000 J
APPEARS IN
RELATED QUESTIONS
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.
(b) How much energy is transferred to the heater each second?
The heat produced by passing an electric current through a fixed resistor is proportional to the square of:
(a) magnitude of resistance of the resistor
(b) temperature of the resistor
(c) magnitude of current
(d) time for which current is passed
Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?
Which metal is used to make the filament of an electric bulb?
True or False – If False give the correct answer
The fuse wire does not melts whenever there is overload in the wiring.
Which of the following is correct?
Mark the correct choice
- Assertion: Electric appliances with a metallic body have three wire connections.
- Reason: Three-pin connections reduce the heating of the connecting wires.
Match the following
| 1. | Bulb | a. | Conductor |
| 2. | Electroplating | b. |
Insulator |
| 3. | Pure water | c. | Heating effect of current |
| 4. | Salt solution | d. | Chemical effect of current |
In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.
| A | B | C | D |
 |
 |
 |
 |
