I'm confused what's the difference between voltage and current ? also what's the difference if I power a 1.5v motor with 3 1.5 battery's in parallel and same motor in 3 1.5 battery's in series

You could look this up on Wikipedia; their basic science articles are pretty good.

Voltage is analogous to pressure -- the higher the voltage, the more "electric flow" you get.

Current is that flow itself -- how many electrons are going through your wire per second.

Voltage and current are related to each other (in the DC case) through resistance -- how much effort does it take to get the electrons to move through your circuit/device. That relationship is Ohm's Law: V = I× R.

Your second question is asking about parallel vs. series. With the batteries in parallel, you get just the 1.5V to drive the flow, but you get a total current summed over all the batteries (so three times as much current as one battery).

With the batteries in series, each battery can "boost" the flow by its own voltage, so the total voltage is also tripled (4.5V).

. To clarify a few things in kelseymh's excellent explanation: > Voltage is analogous to pressure... . Insert "water" before "pressure." Or "hydraulic." Not a big deal, but may make it easier to understand. > ...higher the voltage, the more "electric flow"... . That should be "pressure" not "flow." Although current does rise when you increase the volts (see Ohm's Law), the way he stated it may be confusing to a newbie. > ...three times as much current as one battery... . Insert "is available" before "as one." It won't actually put out more current unless the circuit calls for it. > With the batteries in series,... . The current available will be the same as one cell. . In series, add the volts. In parallel, add the current.

Voltageis analogous to pressure -- the higher the voltage, the more "electric flow" you get.Currentis that flow itself -- how many electrons are going through your wire per second.Voltage and current are related to each other (in the DC case) through

resistance-- how much effort does it take to get the electrons to move through your circuit/device. That relationship isOhm's Law:V=I×R.Your second question is asking about

parallelvs.series. With the batteries in parallel, you get just the 1.5V to drive the flow, but you get a total current summed over all the batteries (so three times as much current as one battery).With the batteries in series, each battery can "boost" the flow by its own voltage, so the total voltage is also tripled (4.5V).