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) |
विकल्प
same in all the cases
minimum in case (i)
maximum in case (ii)
maximum in case (iii)
Advertisements
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
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series.
What do the following symbols mean in circuit diagrams?
Draw circuit symbols for
a cell
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.
- By which method are the appliances connected?
- What must be the potential difference across individual appliances?
- Will the current passing through each appliance be the same? Justify your answer.
- Why are the domestic appliances connected in this way?
- If the T.V. stops working, will the other appliances also stop working? Explain your answer.
What is open circuit?
Find the odd one out and give its explanation.
In the given circuit diagram, which of the given switch(s) should be closed. So that only bulb A glows.
Draw the circuit diagram for the series connection.
In which of the following circuits are the bulb connected in series?
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?
Study the electric circuit below. Which of the following switches should be closed so that only two bulbs will light up
Fuse is
In a simple circuit, why does the bulb glow when you close the switch?
What are the types of electric circuits?
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?
Match the following
| 1. | Insulator | a. | Coulomb |
| 2. | Conductor | b. | Electric circuit |
| 3. | Closed path | c. | Copper |
| 4. | Electric charge | d. | Rubber |
Overloading of electric circuits can lead to short-circuiting.
How is Joule's law effect useful in electric circuits where fuse is used as a safety device?
