Electricity 10th

The two end terminals of resistance are

• Not changeable

• Of fixed polarity

• Interchangeable

• Of variable polarity

The net resistance R of the series combination of three resistance R1 , R2, R3 is given by

• R= R1 + R2+ R3

• R= R1 X R2 X R3

• R= R1 + R2 - R3

• R= R1 - R2 - R3

.

• a

• b

• c

• d

The voltage drop across each resistance of a series combination of resistance is directly proportional to the corresponding resistance

• Incorrect

• Correct

• Sometimes only

• Depends on value of voltage

the resultant resistance in series combination of three resistance 1 ohm 2 ohm and 3 ohm is

• 3 ohm

• 6 ohm

• 9 ohm

• 12 ohm

the resultant resistance in parallel combination of three resistance 1 ohm 2 ohm and 3 ohm is

• 3/11 ohm

• 4/11 ohm

• 5/11 ohm

• 6/11 ohm

The correct relationship for electric energy is given by

• W = I²R t

• W= I³ R t

• W= I R³ t

• W= I R t³

The SI unit of electrical energy is

• ohm

• volt

• ampere

• joule

Which of the following does not represent electric power relationship?

• P=V I

• P= W/ t

• P= I² R

• P= V/ R

The material used to make heating coil in an electric iron is

• Aluminium

• Tungsten

• Chromium

• Nichrome