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प्रश्न
Which particles constitute the electric current in a metallic conductor?
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उत्तर
The flow of negatively charged particles (electrons) in a metallic conductor constitutes electric current.
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संबंधित प्रश्न
1 A = _________ mA
- 102
- 103
- 10-3
- 10-6
Which statement/statement is/are correct?
1. An ammeter is connected in series in a circuit and a voltmeter is connected in parallel.
2. An ammeter has a high resistance.
3. A voltmeter has a low resistance.
(a) 1, 2, 3
(b) 1, 2
(c) 2, 3
(d) 1
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
A p.d. of 6 V is applied to two resistors of 3 Ω and 6 Ω connected in parallel. Calculate:
(a) the combined resistance
(b) the current flowing in the main circuit
(c) the current flowing in the 3 Ω resistor.
Draw a circuit diagram to show how two 4 V electric lamps can be lit brightly from two 2 V cells.
Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line.
(d) Which circuit would have less current in it?
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
Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45
Tick(✓) the correct choice in the following:
When the length of a conductor is doubled the resistance of the conductor
will
Electrical appliances have voltage and power ratings as listed below. Which
has the larger working resistance?
| Appliances | Voltage (V) | Power (W) |
| (a) Washing machine | 250 | 3000 |
| ( b) Television | 240 | 160 |
| (c)240 | 240 | 1500 |
| ( d) Hair curler | 250 | 20 |
| ( e) Car head lamp | 12 | 36 |
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.
State whether the current is a scalar or vector?
What should I choose ___________________
b. for getting protection from electric current.
c. to measure the current in the circuit?
Problems for practice:
If 5A current flows through a circuit, then convert the current in terms of microampere?
