Tag: effect of electric current

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Questions Related to effect of electric current

Multiple choice physics electric current and its effects thermal effect of electric current heating effect of electric current effect of electric current

The essential requirements for a good heating element are _________________.

  1. High resistivity and low melting point

  2. High resistivity and high melting point

  3. Low resistivity and low melting point

  4. Low resistivity and high melting point
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

ESSENTIAL REQUIREMENTS OF GOOD HEATING ELEMENT High-specific resistance so that small length of wire may be required to provide given amount of heat. High-melting point so that it can withstand for high temperature, a small increase in temperature will not destroy the element.

Multiple choice physics electric current and its effects thermal effect of electric current heating effect of electric current effect of electric current

If the current is flowing through a $10 \Omega$ resistor, then in which case the maximum heat will be generated?

  1. $5 \ ampere \ in \ 2 \ minutes$
  2. $4 \ ampere \ in \ 3 \ minutes$
  3. $3 \ ampere \ in \ 6\ minutes$
  4. $2 \ ampere \ in \ 5 \ minutes$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heat generated $H = i^2 Rt$

(A) : $H _A = (5)^2 (10) (2\times 60) = 30 kJ$
(B) : $H _B = (4)^2 (10) (3\times 60) = 28.8 kJ$

(C) : $H _C = (3)^2 (10) (6\times 60) = 32.4 kJ$
(D) : $H _D = (2)^2 (10) (5\times 60) = 12 kJ$

Thus maximum heat is generated in case $C$.

Multiple choice physics electric current and its effects thermal effect of electric current heating effect of electric current effect of electric current

Name the effect of current responsible for the glow of the bulb in an electric circuit.

  1. Chemical

  2. Heating

  3. Magnetic

  4. Heating and Magnetic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The electric bulb has a filament called tungsten when electricity passes through this filament, it heats up and glows. 

This heat is generated due to the passage of electric current, the drift of electrons due to the current and the resistance it has.
Hence, the heating effect of electric current is responsible for the glow of the bulb in an electric circuit.