- #1
songoku
- 2,328
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- Homework Statement
- The generator of a car idling at 1100 rpm produces 12.7 V. What will the output be at a rotation speed of 2500 rpm, assuming nothing else changes?
- Relevant Equations
- ε = N B A ω sin ωt
First I assumed the question asks about max e.m.f so I just used ratio:
output voltage = (2500 / 1100) x 12.7 = 28.9 V, but the answer is wrong.
Then I tried to use the ratio of the whole formula:
$$\frac{\varepsilon_{1}}{\varepsilon_{2}}=\frac{NBA \omega_{1} \sin(\omega_{1}t)}{NBA \omega_{2} \sin(\omega_{2}t)}$$
But I can't calculate because I don't know the value of ##t##.
What is the approach to solve this question? Thanks
output voltage = (2500 / 1100) x 12.7 = 28.9 V, but the answer is wrong.
Then I tried to use the ratio of the whole formula:
$$\frac{\varepsilon_{1}}{\varepsilon_{2}}=\frac{NBA \omega_{1} \sin(\omega_{1}t)}{NBA \omega_{2} \sin(\omega_{2}t)}$$
But I can't calculate because I don't know the value of ##t##.
What is the approach to solve this question? Thanks