May 7, 2023
A-Level Physics Question Analysis Topic: Physics - Circuit
Exam Question:
1) Two electric bulbs P and Q have their resistances in the ratio of 1:2. They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.
Answer:
For A-Level Physics, you should know:
1) We know that the resistance of the bulbs are in the ratio of 1:2 (P:Q).
We also know that the formula for power is Power = I2R
By using the ratio given:
PP/PQ = I2RP/I2RQ
The bulbs are connected in series. Thus, current flowing in them should be the same i.e., IP = IQ = I
Utilising the ratio again, we have:
PP/PQ = RP/RQ = 1/2
Work hard for your A-Level Physics examination!
End of analysis. Great!