Tag: effects of electric current

Quizzes (19) Questions (134)

Questions Related to effects of electric current

Multiple choice physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

State whether given statement is True or False.
We must not touch electric switches with bare hands.

  1. True

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

It is not in general sense, but for protection purpose from any kind of defect in the insulator material damage in the electrical switch we must not touch it withh bare hands specially in case our hands are wet.

Multiple choice physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

A person may get a severe electric shock on touching a :

  1. a neutral wire

  2. a live wire

  3. an earth wire

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A person may get a severe electric shock on touching the live wire. Because live wires have high potential and current flows through our body (low potential ). Thus we get electric shocks.

Multiple choice physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

Wires used in homes are usually covered with materials like plastic or rubber. The primary reason for doing this is to :

  1. prevent rusting

  2. make handling easier

  3. prevent shocks & short circuits

  4. make them look beautiful
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Wires used in homes are usually covered with materials like plastic or rubber, because plastic and rubber are bad conductors of electricity and do not allow current to flow. This prevents us from getting a shock due to a  short circuit.
Multiple choice physics effects of electric current thermal effect of electric current heating effect of electric current electric current and its effects

How much units of energy is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)

  1. 100 kwh

  2. 150 kwh

  3. 160 kwh

  4. 500 kwh
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Given :    $P = 0.05$ kW               $t = 10$ hours per day 
Number of bulbs     $n = 10$
Energy consumed per day       $E= nPt = 10 \times 0.05\times 10 = 5$ kwh  per day
Total energy consumed in 30 days    $E _t = 5\times 30 = 150$ kWh
Multiple choice physics effects of electric current thermal effect of electric current heating effect of electric current electric current and its effects

Which of the following is true for electrical energy?

  1. $E = P \times t$
  2. $E = \dfrac{P}{t}$
  3. $E = \dfrac{{V}^{2}}{Rt}$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrical energy consumed by an electric appliance is equal to product of its power rating and time for which it is used $E = P \times t$.