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प्रश्न
What is the unit of electric current?
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उत्तर
The SI unit of electric current is ampere and is denoted by the letter, A.
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संबंधित प्रश्न
The SI unit of charge is volt.
Three 2 V cells are connected in series and used as a battery in a circuit.
How many joules of electrical energy does 1 C gain on passing through (i) one cell (ii) all three cells?
In which direction does conventional current flow around a circuit?
How many milliamperes as there in 1 ampere?
Why should the resistance of:
an ammeter be very small?
If the current through a floodlamp is 5 A, what charge passed in 10 seconds?
(a) 0.5 C
(b) 2 C
(c) 5 C
(d) 50 C
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.
(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A
What happens to the other bulbs in a parallel circuit if one bulb blows off?
State the S.I. unit of current.
Find the potential difference required to pass a current of 0.2 A in a wire of resistance 20Ω
Name the principle on which a transformer works.
Tick (✓) the correct choice among the following :
(a) A strong short bar magnet is dropped into a solenoid connected to a
galvanometer as shown in fig . The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.
Tick (✓) the correct choice among the following :
Which of the following changes would enable a millimeter to be used as a
direct current ammeter reading upto 1 A?
State whether the current is a scalar or vector?
Conventionally, the direction of the current is taken as:
An ammeter is always placed in parallel with the circuit.
Match the items in column-I to the items in column-II:
| Column - I | Column - II |
| (i) electric current | (a) volt |
| (ii) potential difference | (b) ohm meter |
| (iii) specific resistance | (c) watt |
| (iv) Electrical power | (d) joule |
| (v) electrical energy | (e) ampere |
What does the direction of current convey?
