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प्रश्न
Draw a circuit diagram showing two lamps, one cell and a switch connected in series.
How can you change the brightness of the lamp?
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उत्तर
The brightness of the lamp can be changed by connecting the lamps in parallel.
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संबंधित प्रश्न
How many milliamperes as there in 1 ampere?
Which of the two is connected in series : ammeter or voltmeter?
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
State the factors on which the strength of electric current flowing in a given conductor depends.
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
Three resistors of 6.0 𝛀, 2.0𝛀 and 4.0𝛀 are joined to an ammeter A and a cell of e.m.f. 6.0 V as
shown in fig 8.52 Calculate:
(a) the effective resistance of the circuit and
(b) the reading of ammeter.
Define the following:
Super conductors
A charge of 80 C flows in a conductor for 2 minutes.
(a) Calculate the current flowing through the conductor.
(b) If the current through a heater is 4 A what charge must be passing in 8 seconds?
Find the effective resistance in the following circuit diagrams (Fig.):
Define the term kilowatt - hour and state its value in S.I. unit.
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
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 energy dissipated in the bulb in 10 minutes.
One unit of electrical energy consumed is equal to 1000 kilowatt-hour.
Problems for practice:
If 5A current flows through a circuit, then convert the current in terms of microampere?
Define the following:
Conventional current
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 |
In electrolytes such as salt solutions, the charge carriers are:
