Advertisements
Advertisements
प्रश्न
In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12 V battery will be
 |
 |
 |
| (i) | (ii) | (iii) |
पर्याय
same in all the cases
minimum in case (i)
maximum in case (ii)
maximum in case (iii)
उत्तर
maximum in case (iii)
Explanation -
Heat produced in time (t) is given by
Heat (H) = `"V"^2/"R" xx "t"`
where, V = potential difference
R = Net resistance of the circuit
t = time
`"R"_(1"net") = 2Ω`
`"R"_(2"net") = 2Ω + 2Ω = 4Ω`
`"R"_(3"net") = (2xx2)/(2+2) = 1Ω`
Since, R3net is minimum so heat produced will be maximum in case (iii).
APPEARS IN
संबंधित प्रश्न
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
In any electric circuit, when the switch is on and the current flows through it why do the wire, switches, bulb or devices become hot?
How much is the potential difference between live and neutral wires?
Rahul wants to make an electric circuit. He has a bulb, two wires, a safety pin, and a piece of copper. He does not have any electric cell or battery. Suddenly he gets some idea. He uses lemon instead of a battery and makes a circuit. Will the bulb glow?
In the circuit shown, which switches (L,M or N) must be closed to light up the bulb?
Higher Order Question
A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder), and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.
- What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
Name the device used these days in place of electric fuses in electrical circuits.
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
Paheli connected two bulbs to a cell as shown in Fig. 12.8.
She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.
