हिंदी

Why Should the Resistance Of: an ammeter be very small? - Science

Advertisements
Advertisements

प्रश्न

Why should the resistance of: 

 an ammeter be very small?

Advertisements

उत्तर

 An ammeter should have a very low resistance so that it will not change the value of the current flowing in the circuit.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Electricity - Exercise 2

APPEARS IN

लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 2 | Q 20.1

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

One coulomb charge is equivalent to the charge contained in:

(a) 2.6 × 1019 electrons
(b) 6.2 × 1019 electrons
(c) 2.65 × 1018 electrons
(d) 6.25 × 1018 electrons


Compare how an ammeter and a voltmeter are connected in a circuit.


 Which instrument is used to measure electric current? How should it be connected in a circuit?


Which unit could be used to measure current?

(a) Watt
(b) Coulomb
(c) Volt
(d) Ampere


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. 

(a) Which circuit would have the highest voltage across each bulb?


If you were going to connect two light bulbs to one battery, would you use a series or a parallel arrangement? Why? Which arrangement takes more current from the battery?


Two resistors of 2.0 Ω and 3.0 Ω are connected (a) in series (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case draw a circuit diagram and calculate the current through the battery. 


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. 


If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?


Is kWh the unit of electrical energy?

An electric bulb is rated at 220 V, 100 W. What is its resistance? What maximum current can be passed through it?

Name the physical quantity which equals the product of voltage and current.

What will be the current drawn by an electric bulb of 40 W when it is connected to a source of 220 V?

How does an alternating current differ from the direct current?

Can a copper wire be used as a fuse wire?

Name the principle on which a transformer works.


Tick (✓) the correct choice among the following :

There are 500 turns and 2000 turns in the primary and secondary coil of a
transformer respectively. If th e output voltage is 1000 V, how large is the
input voltage?


An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.


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


When an electric current is passed, electrons move from:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×