Advertisements
Advertisements
प्रश्न
Which instrument is used to measure electric current? How should it be connected in a circuit?
Name the device used for measuring electric current. How is it connected in a circuit?
Advertisements
उत्तर
Current is measured by an instrument called an ammeter. An ammeter is always connected in series with the circuit components because it has very low resistance. Connecting it in series ensures that the same current flows through the ammeter as through the circuit, without significantly altering the circuit’s total resistance.
संबंधित प्रश्न
1 A = _________ mA
- 102
- 103
- 10-3
- 10-6
By what name is the physical quantity coulomb/second called?
Which particles constitute the electric current in a metallic conductor?
The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:
(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A
Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45
A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:
(i) the internal resistance and (ii) e.m.f. of the cell.
Complete the following sentence:
A fuse is a short piece of wire of high ......... and low
Complete the following sentence:
Fuse wire has a ............ Melting point and it is made of an alloy of ......... and if the current in a circuit rises too high, the fuse wire ...........
Two resistors of 4 Ω and 6 Ω are connected in parallel. The combination is
connected across a 6 volt battery of negligible resistance. Calculate:
( i) The power supplied by the battery,
(ii) The power dissipated in each resistor.
Find the effective resistance in the following circuit diagrams (Fig.):
What is the purpose of fuse in an electrical circuit?
State the S.I. units of electrical power.
An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
Unit of electric power may also be expressed as
What does the direction of current convey?
