Test: Electricity - 1 - UPSC MCQ

In an electric circuit all other elements are connected in series but a voltmeter is connected in parallel.

it's  one of the three primary factors (length, cross-sectional area, and nature of material) directly used in calculating resistance using the formula R = ρL/A.

In parallel combination, the equivalent resistance is Smaller than the least resistance used in the circuit.

In parallel combination voltage remains same across two points.

The resistance of an alloy increases with increase in temperature.

Three resistors of 2Ω is required to get 6Ω because resultant is more than individual so they all must be connected in parallel.

In series grouping current I is same throughout and potential differences are directly proportional to respective resistances.
In given circuit 
∴ V₁ = IR₁ = 2 A x 1Ω = 2V,

V₂ = IR₂ = 2 A x 2 Ω = 4 V and

V₃ = IR₃ = 2 A x 3 Ω = 6 V.

Resistance = slope line of V-I graph

In the circuit shown, the resistors B, C and D are connected in series.