A heater coil of resistance is connected in parallel with another coil of unknown…
MATHEMATICS · Multi-part · A Level · Mathematics · Quantities and units in mechanics · Quantities and units in mechanics
Problem
A heater coil of resistance R1=10Ω is connected in parallel with another coil of unknown resistance R2 across a 24V battery. It is observed that the power developed in the unknown coil is exactly twice the power developed in the 10Ω coil.
Answer the following.
(i) Using the given condition, calculate the value of R2.
(ii) Determine the current drawn from the battery by the entire parallel combination.
(iii) How much electrical energy is converted into heat in both coils together in 2min?