All Questions
6 questions
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Understand power rating in layman terms
I have recently started the chapter of electricity of class 8. I am not understanding the concept of power rating of appliances. When we say that a bulb is rated 220V-100W, which means, according to ...
- 213k
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3
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Why doesn't voltage increase when the wire length increases; there's more work to be done?
This Q&A did not answer my question.
The voltage of a circuit is the difference in each Coulombs potential energy at the negative pole, compared to the positive pole. At the negative pole, there's ...
- 11.1k
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3
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How is energy used in a circuit?
I understand the concept of voltage and why electrons flow and my guess is their potential gradually decreases as they get closer to the cathode until it reaches 0. However, the energy in a circuit is ...
CommunityBot
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1
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Why aren't salt water batteries used to power cars instead of lithium-ion?
I know salt water batteries are less efficient than lithium-ion, but water is safer, can be found anywhere, is cheap and 100% ecological. Even if it doesn't last long, you can refill anywhere. Why can'...
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Solving kinetic energy exercise through electrical work formula instead of voltage formula?
While studying electric potential, I run into an issue on exercise 43 of Chapter 24 of Fundamentals of
Physics 8th ed. Vol. 3 (Halliday et al.).
The exercise states the following, paraphrased:
A ...
- 119k
1
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3
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Electric Power $P$
In my textbook there are 2 formulas for electric power:
$$\begin{array}{cccr}
P &=& E/t &\hspace{10pt} (1) \\
P &=& VI. &\hspace{10pt} (2)
\end{array}$$
What is the ...
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