Class 12 Power Chapter 1 Basics Electricity II

Class 12 Power Chapter 1 Basics Electricity II Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Power Chapter 1 Basics Electricity II Question Answer and select need one. Class 12 Power Chapter 1 Basics Electricity II Notes Download PDF. AHSEC Class 12 Elective Electrical Power System Question Answer English Medium.

Class 12 Power Chapter 1 Basics Electricity II

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Elective Electrical Power System Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 12 Electrical Power System Textbook Solutions English Medium for All Chapters, You can practice these here.

Basics Electricity II

Chapter: 1

SESSION 1: BASIC ELECTRICAL QUANTITY

Exercise

1. Explain the following:

(i) Voltage.

Ans: Voltage: The force motivating electrons to “flow” in a circuit is called voltage. The voltage is electrical pressure, a potential force or difference between electrical charges between two points. Voltage pushes the current in a wire. Voltage exists between positive and negative terminals of a battery. Voltage (E or V) is measured in Volts and is abbreviated by the symbol “V”.

One Volt means the force move one coulomb of electrons in one second.

(ii) Current.

Ans: Current: An electric circuit is formed when a conductive path is created to allow electrons to move continuously. This continuous movement of free electrons through the conductors of a circuit is called a current, and it is often referred to in terms of “flow,” just like the flow of a liquid through a hollow pipe. Current flows in a wire pushed by voltage. Current (I) is measured in Ampere and is designated by the symbol “A”.

Ampere: if one coulomb charge cross over the area of cross section of the conductor per one second then the value of current through the conductor is called ‘One Ampere’.

(iii) Resistance.

Ans: Resistance: Free electrons tend to move through conductors with some degree of friction, or opposition to motion. This opposition to motion is more properly called resistance. The amount of current in a circuit depends on the amount of voltage available to motivate the electrons, and also the amount of resistance in the circuit to oppose electron flow. The resistance (R) is measured in Ohms and is designated by the symbol “Ω”.

One Ohm – When a conductor having 1 V potential between the two end points, one ampere current will flowing through conductor and the resistance value of conductor is 1 Ohm (Ω).

2. A circuits has two lamps of 100 each 3 tube lights of 40 Watt each, 3 tube lights of 40 watt each, 2 ceiling fans of 80 watt each. Calculate the total wattage? 

Ans:  Given: 2 lamps of 100 W each

3 tube lights of 40 W each

2 ceiling fans of 80 W each

Step 1: Calculate total for each appliance

Lamps: 2 × 100 W = 200 W

Tube lights: 3 × 40 W = 120 W

Ceiling fans: 2 × 80 W = 160 W

Step 2: Add all wattages

Total wattage = 200 W + 120 W + 160 W

 = 480 W

Total Wattage = 480 Watts (W)

3. The smallest particle of an element is known as —

(a) Atom. 

(b) Molecule. 

(c) Nucleus. 

(d) Electron.

Ans: (a) Atom. 

4. The atom is composed of —

(a) Electron only. 

(b) Proton only. 

(c) Neutrons only. 

(d) Electron, Proton, neutrons. 

Ans: (d) Electron, Proton, neutrons.

5. The supply for domestic purpose is —

(a) 110- 120 V. 

(b) 120- 130 V. 

(c) 220- 230 V. 

(d) 400- 440 V.

Ans: (c) 220- 230 V.

6. Tick T if you think the statement is true; Tick F if you think the statement is false.

The signals, which is continuous and can have any value in a limited range, is known as analog signal (T/F)

Ans: True.

SESSION 2: ELECTRONIC COMPONENTS

Exercise

1. Which one of the following is an active component?

(a) Resistance.

(b) Inductor.

(c) Transistor.

(d) Capacitance.

Ans: (c) Transistor.

2. A milli watt is equal to —

(a) 1/10 watt.

(b) 1/100 watt.

(c) 1/1000 watt.

(d) 1000 watt.

Ans: (c) 1/1000 watt.

3. Which one of the following is not an electromechanical component?

(a) Vibrator.

(b) Relay.

(c) Transformer.

(d) Switch.

Ans: (c) Transformer.

4. In the colour code of resistance in electronic circuits, the tolerance is resented by —

(a) First band.

(b) Second band.

(c) Third band.

(d) Fourth band.

Ans: (d) Fourth band.

5. In the 4-band colour code resistance, the number 2 is indicated by colour —

(a) Red.

(b) Yellow.

(c) Black.

(d) Green.

Ans: (a) Red.

6. The capacitance is measured in —

(a) Henry.

(b) Ohms.

(c) Hertz.

(d) Farads.

Ans: (d) Farads.

7. The capacitance of a parallel plate capacitor will be more if —

(a) Plates have a large area and short distance between plates.

(b) Plates have small areas and large gap between plates.

(c) Small area of plates and high applied voltage.

(d) Large plate area, large plate distance and dielectric of low value.

Ans: (a) Plates have a large area and short distance between plates.

8. Which value of AC current is measured by ammeters?

(a) Peak value.

(b) Average value.

(c) Instantaneous value.

(d) R.M.S. value.

Ans: (d) R.M.S. value.

SESSION 3: DRAW AND DESIGN BASIC CIRCUITS

Exercise