Advertisements
Advertisements
प्रश्न
Why should the resistance of:
a voltmeter be very large?
Advertisements
उत्तर
A voltmeter should have a high resistance so that it can take only a negligible amount of current from the circuit.
APPEARS IN
संबंधित प्रश्न
What is the unit of electric current?
How many milliamperes as there in 1 ampere?
How many microamperes are there in 1 ampere?
A Radio Set Draws a Current of 0.36 a for 15 Minutes. Calculate the Amount of Electric Charge that Flows Through the Circuit.
One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor?
Which instrument is used to measure electric current? How should it be connected in a circuit?
An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up.
(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.
Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? why?
Calculate the equivalent resistance between A and B in the adjacent diagram.
Define the following:
Super conductors
Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?
Two cells each having an e.m.f. of 2 V and an internal resistance of 2Ω are
connected (a) In series, and ( b) In para 1le l as shown in fig. . What is the
current flowing through the cir cu it in each_ case?
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.
State the S.I. units of electrical power.
How should the electric lamps in a building be connected?
What is the speed of electric current?
