Question
Question: The power of a heater is 500 watt at 800<sup>o</sup> C. What will be its power at 200<sup>o</sup> C ...
The power of a heater is 500 watt at 800o C. What will be its power at 200o C if α6mu=6mu46mu×6mu10−46muper6mu∘C
A
484 W
B
672 W
C
526 W
D
611 W
Answer
611 W
Explanation
Solution
By using P=i2R=RV2⇒P∝R1
⇒ P2P1=R1R2=(1+αt1)(1+αt2)⇒P2500=(1+4×10−4×800)(1+4×10−4×200)
⇒ P2500=1.321.08⇒611W