in an electric circuit, does the power input come from the + or the -?

Answer 1

Electron flow in the circuit (outside the battery) is from - to +
Hole flow in the circuit (outside the battery) is from + to -

Power in an electric circuit is defined as:
Watts = Amps x Volts

is equivalent to:
= x

is equivalent to:
P = I x E

Since one cannot have a non-zero value for power without flow(current), then you could say it comes from both - and + being applied to a load.

Answer 2

The power does not really come from either end. The power comes from the electrons in the - end being attracted to the + end.
The electron has less energy at the positive end ( think of water flowing down hill ) so as the electron moves from one end of the battery to the other it releases its extra energy.
In a circut some of this energy can be used to do thinks we want done. (like make music)

Answer 3

through "progression a motor", i am going to anticipate somebody else did the layout, and would have certain the present, and voltage already. Batteries are rated in volts, and then, in case you search for the datasheet from the producer, you could get the amp-acity (typically in milli-amp hours). If a a million.5 volt battery has 2000 mAh ampacity, meaning it may grant 2000 mA for a million hour, or a million mA for 2000 hours, or some thing alongside an similar line. pick how lengthy you want the battery to very last (in hours), multiply through the motor's contemporary, then pick which battery to purchase depending on the reply.

Answer 4

the electron flow in a circuit goes from the (-) to the (+). the (-) on a battery is the source and the (+) is the return. I've been an electronic tech for 33 years

Answer 5

Contrary is convetional wisdom the electron flow comes from ground (-) to potential or load (+).
The cause for the confusion dates back to the early days of electricity ( and physics). Science lacked the equipment to properly track the current.

Answer 6

In most ways you think about it, the + side "gives" the power. It's not totally accurate, but it is the most useful way to think about it.

Of course, electrons themselves flow from the negative terminal to the positive terminal, but it's more useful to think of electricity flowing positive to negative for a variety of reasons. I find it useful to picture electricity as the flow of positive potential from + to -.

Answer 7

Comes from the +ve and ends at the -ve after going throught the entire circuit.

Answer 8

Well the answer really depends on whether you look at it from an electricians point of view or an engineering one. an electron counts holes, they don't exist, but holes travel from positive to negative,(+ to -) an engineer counts electrons, an actual particle which moves from negative to positive (- to +) so it relay doesn't matter

Answer 9

Depends on your circuit.

If you are learning basic circuits, imagine from - to +

Answer 10

You can think of it as the postive (+) since it has a high electrical potential. You can think of the (-) as ground or earth.