Tag: physics

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Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

The maximum current which can flow through a fuse without melting it is called its

  1. potential

  2. power

  3. rating

  4. capacity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The maximum current which can flow through a fuse without melting it is called its rating.
For example a fuse rated at 8 A, can stand current upto 8 A. If current higher than 8 A flows through the fuse, it would melt and circuit gets broken.the rating of a fuse depends upon the thickness of the fuse wire (because length of the wire is fixed). The thicker fuse has higher rating. So, the thickness of the fuse wire in 8 A circuit is more than that of the fuse wire in 5 A circuit.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

All appliances in a domestic electric circuit are connected in parallel so that

  1. Voltage drop across each appliance is same.

  2. Current through each appliance is same.

  3. Power consumed by each appliance is same.

  4. It allows amplification of power
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Voltage drop is the driving force in any electrical circuit. Hence, it is desired to supply same voltage everywhere.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Potential difference of 220-250 V is present between 

  1. Earth wire and neutral wire

  2. Live wire and earth wire

  3. Live wire and neutral wire

  4. B and C both
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Potential difference between live wire and neutral wire is about 220 V-250 V. which is generally provided for household purposes in homes for electricity. so correct option is C.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

The rating of a fuse depends upon the

  1. thickness of the fuse wire

  2. length of the wire

  3. both

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The maximum current which can flow through a fuse without melting it is called its rating.
For example a fuse rated at 8 A, can stand current upto 8 A. If current higher than 8 A flows through the fuse, it would melt and circuit gets broken.

The rating of a fuse depends upon the thickness of the fuse wire(because length of the wire is fixed).the thicker fuse has higher rating. So, the thickness of the fuse wire in 8 A circuit is more than that of the fuse wire in 5 A circuit.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Mark the incorrect statement.

  1. In our homes, we receive supply of electric power through a main supply

  2. Red insulation cover, is called live wire

  3. The earth wire, has insulation of green colour

  4. None
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In our homes, we receive supply of electric power through a main supply (also called mains), either supported through overhead electric poles or by underground cables. One of the wires in this supply, usually with red insulation cover, is called live wire (or positive). Another wire, with 
black insulation, is called neutral wire (or negative). In our country, the 
potential difference between the two is $220   V$. At the metre-board in the house, these wires pass into an electricity meter through a main fuse. Through the main switch they are connected to the line wires in the house. These wires supply electricity to separate circuits within the house. Often, two separate circuits are used, one of $15   A$ current rating for appliances with higher power ratings such as geysers, air coolers, etc. The other circuit is of 5 A current rating for bulbs, fans, etc. The earth wire, which has insulation of green colour, is usually connected to a metal plate deep in the earth near the house. This is used as a safety measure, especially for those appliances that have a metallic body, for example, electric press, toaster, table fan, refrigerator, etc. The metallic body is connected to the earth wire, which provides a low-resistance conducting path for the current. Thus, it ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, and the user may not get a severe electric shock.

Multiple choice physics electrical circuits domestic electric circuits and safety precautions domestic and commercial circuit electric power

Each electrical appliance is provided with a _______ core flexible cable. Fill in the blank.

  1. 3

  2. 2

  3. 1

  4. 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each electrical appliance is provided with three (3) core flexible cables. The insulation on the three wires is of different colours i.e  Brown for live wire, blue for neutral wire and green or yellow for earth wire.