Question

Rank these five identical bulbs (with ideal battery), from brightest to dimmest?

Answer 1

Ok so I know brightness is determined by Power.

and P= I^2 R, right?

Answer 2

The problem says that some may be equal.

Answer 3

What do they mean by "ideal battery" by the way?

Answer 4

@IrishBoy123

Answer 5

ideal battery = constant potential difference

i suspect it is a distraction in your question.

Answer 6

So i need to look at their currents.

Answer 7

Is it correct to say that P will be the brightest because current wouldn't have dissipated as much? Since current flows from positive to negative?

Answer 8

The current doesn't drop as you go along a circuit, if that is what you mean. So proximity to the battery doesn't mean anything

look at the arrows. the current diverges as indicated, much as water will split into separate flows if given the option

all very hand-wavey but only P gets the full current in the circuit. therafter it splits out into various parallel curcuits

....and it is only at the point marked "X" that the current "re-unites" again.

So P should be brightest

Answer 9

Ohh that makes a lot of sense!

Answer 10

Thank you!