Advertisements
Advertisements
Question
What is the Flow of Charge Called?
Advertisements
Solution
The flow of electric charge in a conductor is called electric current. If a charge of Qcoulombs flows through a conductor in time t seconds, the magnitude of electric current is given by, I = Q/t.
APPEARS IN
RELATED QUESTIONS
The SI unit of charge is volt.
Which of the following equation shows the correct relationship between electrical unit?
1A = 1C/s or 1c= 1A/s
You can given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?
What happens to the other bulbs in a series circuit if one bulb blows off?
Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs:
(b) for lighting inside the rooms of the hotel?
An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?
Draw a circuit diagram showing two electric lamps connected in parallel together with a cell and a switch that works both lamps. Mark an â’¶ on your diagram to show where an ammeter should be placed to measure the current.
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 |
An electric kettle has a heating element which is rated at 2 kW when connected to a 250 V electric supply. Calculate the
(a) Current which flows in the element when it is connected to a 250 V supply,
(b) Resistance of the filament,
(c) Heat produced in 1 minute by the element,
(d) Cost of running the kettle for 10 minutes a day for 30 days of the month, at the rate of Rs. 3.00 per unit.
Name the principle on which a transformer works.
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?
Define an electric current.
When an electric current is passed, electrons move from:
Calculate the current in a wire if a charge of 1500 coulomb flows through it in 5 minutes.
1020 electrons, each having a charge of 1.6 x 10-19 C, flows in a circuit V is 0.1s. What is the current in ampere?
