Advertisements
Advertisements
प्रश्न
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate :
The total current taken from the supply
Advertisements
उत्तर
Given ,
Power , P = 250 W
Voltage , V = 100 V
Current through each heater , I = ?
As P = VI
`=> "I" = "P"/"V"`
`= 250/100 = 2.5 "A"`
∴ Current taken for the three heaters = 3 × 2.5 = 7.5 A
संबंधित प्रश्न
How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?
State the factors on which the strength of electric current flowing in a given conductor depends.
Which effect of current is utilised in an electric light bulb?
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.
A wire is passed through a piece of cardboard as shown in fig .. An electric current flows vertically down the wire and then flows back up. The two sections of the write are observed to repel each other.
(a) Wi th the aid of a diagram, describe how you would plot the magnetic field lines on the card .
(b) Sketch the magnetic field patterns around both the sections of the wire. Use your sketch to explain why the two sections repel each other.
(c) The repulsive force between the two sections is small. What changes could be made to increase it?
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 total energy supplied by the battery in 10 minutes
How should the electric lamps in a building be connected?
Three resistances, of which two are equal when connected in series have an effective resistance of 30 ohms. When the three resistances are connected in parallel, the effective resistances is 3 ohms. Find the values of the individual resistances.
Which of the following represents voltage?
