CAIE A-Level Physics AS 9.2.3 P Vi P I 2r and P V 2 R Questions
Use P = VI, P = I²R and P = V²/R to calculate electrical power.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- Use P = VI, P = I²R and P = V²/R to calculate electrical power.
CAIE A-Level Physics AS 9.2.3 P Vi P I 2r and P V 2 R Questions question 1
Fig. 5.2 shows a circuit with a battery of electromotive force (e.m.f.) 12.0 V connected to a linear potentiometer AB and two identical filament lamps P and Q .
Fig. 5.2
The battery has negligible internal resistance and the lamps each have the same I-V characteristic shown in Fig. 5.1.
When the slider of the potentiometer is at its midpoint, as shown in Fig. 5.2, the current I in the battery is 1.78 A .
Determine:
the total power dissipated in lamps P and Q
total power = W
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