Advertisements
Advertisements
Question
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
Advertisements
Solution
The correct statement is:
(d) 1
An ammeter is connected in series in a circuit and a voltmeter is connected in parallel. The other two statements are incorrect as an ammeter should have a very low resistance and a voltmeter should have a high resistance.
APPEARS IN
RELATED QUESTIONS
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 lamps in a house hold circuit are connected in parallel because:
(a) this way they required less current
(b) if one lamp fails the others remain lit
(c) this way they require less power
(d) if one lamp fails the other also fail
How does the heat H produced by a current passing through a fixed resistance wire depend on magnitude of current I?
If the current passing through a conductor is doubled, what will be the change in heat produced
State three factors on which the heat produced by an electric current depends. How does it depend on these factors?
A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
Define the following:
Electromotive force
What is the criteria for selecting a fuse wire?
An auto lamp is joined to a battery of e.m.f. 4 V and internal resistance 2.5Ω. A steady current of 0.5 A flows through the circuit. Calculate the
(a) Total energy provided by battery in 10 minutes,
(b) Heat dissipated in the bulb in 10 minutes.
Name the principle on which a transformer works.
What is the function of a step-up transformer?
A bulb marked 12 V, 24 W operates on a 12 V battery for 20 minutes. Calculate:
- The current flowing through it, and
- The energy consumed.
Kilowatt hour is the unit of
Problems for practice:
If 5A current flows through a circuit, then convert the current in terms of microampere?
