physical properties of electric current

one volt equals ..................

• (a) ampere x ohm

• (b) joule/coulomb

• (c) coulomb/sec.

• a and b

• b and c

The charge transferred by a constant current of 1 ampere in 1 second.

• 1 ohm

• 1 volt

• 1 ampere

• 1 coloumb

if the work is done to transfer an electric charge of 600 coulombs between two points is 66600 joules, the potential difference between the two points is ……………… volts

• 222

• 111

• 333

We can control the value of the electric resistance by using…………………

• ammeter

• ohmmeter

• rheostat

• voltameter

An electric current whose intensity is 1 ampere passes through a resistance of 20 ohm, then the intensity of the electric current increases to 2 ampere, so the value of the resistance..........................................

• increases to double

• decreases to half

• decreases to quarter

• doesn't change

The ………………….. is used to measure the electromotive force of a battery.

• voltameter

• ammeter

• ohmmeter

• rheostat

Is the electric current intensity passing through a circuit when a charge of one coulomb passes through a given cross-section in one second? (scientific term)

• ampere

• volt

• ohm

Electric current doesn't flow between two conductors, their electric potential are………………

• equal

• unequal

 

In the circuit, if the length of the wire of the rheostat increases, the resistance………………….. and the current intensity……………………….

• increase........increase

• decrease ...........decrease

• increase........decrease

• decrease -------increase

the resistance value is .......................ohm

• 2

• 24

• 1.5

• 0.5