Explanation

• The SI unit of electrical resistance is Ohm (Ω).
• It measures how much a material opposes the flow of electric current.
• Higher resistance means less current flows.
• It is defined by V = IR (Ohm’s Law).
• 1 Ohm = 1 Volt per Ampere.

Last verified on 10-06-2026

Explanation

• Ohm's law, description of the relationship between current, voltage, and resistance.
• Georg Simon Ohm stated that the electric current through a conductor is directly proportional to the voltage across it, provided temperature remains constant. 
• This relationship is called Ohm’s Law.

Last verified on 22-05-2026

Explanation

• First law expresses conservation of energy
• In convention where work is done by system, Q = ΔU + W
• Supplied heat changes internal energy and may also produce work.

Last verified on 11-11-2026

Explanation

• Radiation is the only mode of heat transfer that occurs through a vacuum.
• Radiation transfers heat through electromagnetic waves.
• So it does not need any material medium.
• The Sun's heat reaches the Earth through radiation.

Last verified on 06-07-2026

Explanation

• The unit of specific heat capacity is Joules per kilogram per Kelvin (J/(kg·K)) or Joules per kilogram per Celsius (J/(kg·°C))
• It can also be expressed as J⋅kg−1⋅K−1 or J⋅kg−1⋅°C−1. 

Additional information:

• Joules (J): Represents the unit of energy.
• Kilograms (kg): Represent the unit of mass.
• Kelvin (K) or Celsius (°C): Represents the unit of temperature change.
• Therefore, specific heat capacity indicates the amount of energy (in Joules)
• Required to raise the temperature of one kilogram of a substance by one Kelvin (or one degree Celsius).

Last verified on 11-11-2026