All Questions
6 questions
0
votes
1
answer
115
views
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 ...
0
votes
3
answers
377
views
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 ...
- 248
1
vote
1
answer
226
views
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'...
- 1,029
0
votes
3
answers
647
views
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 ...
- 9
0
votes
1
answer
224
views
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 ...
- 103
1
vote
3
answers
502
views
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 ...
- 121