Recent content by phyphysics

When the generator produces electricity,during the revolutions of the coil,the voltage induced is changing.If the voltage supply of a certain country is 110V, will the voltage supplied is NOT 110V sometimes? Also, the current induced when the coil is set vertically,will the appliance stop...

I have a question: A new light bulb is connected with a power supply, however, it immediately burns out. What are the reasons behind this? Does this's related to the low power rating of the bulb? How?

Some physics books said that the fuse rating is the maximum current that the fuse can carry without melting it. But some said that the fuse rating is indicating the current at which the fuse would immediately melt. Which is true?

Then, say, when 3 cells of 1.5 V are connected in parallel with a fixed resistor, will the total current drawn be larger than the cells connected in series? Why?

When the current is just switched off, then there is no turning effect on both the hairsprings and the iron cylinder. By inertia, the pointer must still pointing at the original reading, say, 8mA, so how can the pointer be flicked back to zero when the current suddenly drops to 0 ?

I have such a question in my physics book: There are 2 statements below. Choose a if the second statement is an explanation of the first statement; otherwise, choose b : 1. Ammeter has a very small resistance. 2. The current in the circuit can be said negligibly affected when the...

When the cells are connected in parallel, what happens to the total current drawn when compared with the arrangement that the cells are connected in series?

I know that the pointer of the galvanometer makes use of the turning effect to indicate the strength of the current. Say, the pointer is moved to the position of 8mA, if the current is suddenly withdrawn, the pointer would be pointing back to zero. What's the mechanism behind this?

how about input power and output power?

What really does the word 'power" mean in the following context? An electric power of 110kW is transmitted through the cables. Input power of the transformer

The current is alternating.

If a copper rod is approaching an uniform magnetic field, what's the direction of the induced current?

If we place a current-carrying solenoid near an induced solenoid with a copper core inside it, is there any induced current?

Increase the number of turns of the induced coil?

In mutual induction, how can we increase the induced current, not e.m.f.?