This question was previously asked in

LPSC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 4 March 2018)

Option 1 : ohm

Subject Test 1: Electrical Basics

3053

20 Questions
80 Marks
30 Mins

__Capacitive reactance:__

Capacitive reactance is given by:

\({X_C} = \frac{1}{{ω C}}\)

With ω = 2πf

\({X_C} = \frac{1}{{2π fC}}\)

\({X_C} \propto \frac{1}{{ f}}\)

The capacitive reactance is inversely proportional to the frequency.

Where C = capacitance value in Farad

The unit of **Capacitive reactance is Ohm.**

__Inductive reactance: __

Inductive reactance (XL) is given by:

XL = ωL

ω = frequency in radian/sec which can be written as:

ω = 2πf

XL = ωL = 2πfL

Where,

f = frequency in Hz

L = value of inductor in Henry

From the above, we conclude that:

XL ∝ f (for a constant L)

The inductive reactance is directly proportional to frequency.

The unit of **Induc****t**ive reactance is Ohm.

Notes:

1). Farad is the unit of capacitance

2). Ampere is the unit of current

3). Volt is the unit of Voltage