Class 10 > Test: Ohm's Law

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Test: Ohm's Law - Question 1

The water heating rod draws 10 A current when connected to certain power source. The resistance of rod is 12 Ω. The source voltage is:

Detailed Solution for Test: Ohm's Law - Question 1

The correct answer is B as Ohm's law:

voltage=current x resistance=12x10=120 V

Test: Ohm's Law - Question 2

Which method can be used for absolute measurement of resistances ?

Detailed Solution for Test: Ohm's Law - Question 2

A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements.

Detailed Solution for Test: Ohm's Law - Question 3

Electrons move from **low potential** to **high potential**. The direction of electric **current** is opposite to the direction of **flow** of electrons.

Hence Electric current always flows from higher to lower potential.

Test: Ohm's Law - Question 4

What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h ?

Detailed Solution for Test: Ohm's Law - Question 4

(1,750 x 40)/1000 = 70 kilowatt-hour.

Test: Ohm's Law - Question 5

The potential difference of a circuit is constant. If the resistance of a circuit is doubled, then its current will become;

Detailed Solution for Test: Ohm's Law - Question 5

According to ohm's law

Current (I) = Potential difference (V) / Resistance(R)

If the potential difference is maintained constant and the resistance is changed,

Cureent (I) is inversely proportinal to the reisistance (R)

V = IR --(1)

Now, here V is constant.

Let , new resistance R' = 2R and assume that current flow be I'

So, from (1),

IR = I'. R',

=> IR = I'. 2R,

Therefore, I' = I / 2

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