An electric immersion heater of resistance operates at for . What is the thermal energy generated?
Answer and explanation
Correct answer: C.
- Step 1: State Joule's heating law formula using voltage and resistance: .
- Step 2: Calculate electric power: .
- Step 3: Multiply power by time: .
Answer
.
Why not the others: '' calculates forgetting squaring; '' halves the power; '' divides by instead of .
Practise more Classical Mechanics, Electromagnetism and Modern Physics.
Free questions with an explanation for every one, and full timed Tawjihi (General Secondary) mock tests.
More Classical Mechanics, Electromagnetism and Modern Physics questions
- A car starts from rest and accelerates uniformly in a straight line at for . What is the total displaceme…
- A constant net force of acts on a crate resting on a frictionless horizontal floor. What is the acceleration…
- A circuit contains three resistors of resistances , , and connected in parallel across an ideal…
- A photon has a frequency of . Given Planck's constant , what…
- A straight conductor of length carrying an electric current of is placed perpendicular to a uniform magneti…
- A mass of attached to a horizontal ideal spring of spring constant oscillates in simple harmonic moti…