# What is the current when there are no resistors?

How come I always see videos with what seems like a random amount of mA flowing from a battery with a certain amount of voltage?

For example, what if a wire had 0.13 ohms resistance and a battery had 5V electrical difference. That would mean that 38 Amps should be the current (right?).

I=V/R
I=5V/0.13ohms


Okay, so I'm editing this now using internal resistance, of about 1ohm.

This gives about 4.5A, so is this correct?

Why are common schematics showing some amount of mA shouldn't it be something like what I've shown, or do they have hidden resistors?

• What is the internal resistance of the battery you are using? Apr 18, 2019 at 11:45
• Are you talking about a real battery or an ideal model of a battery? Apr 18, 2019 at 11:46
• @ElliotAlderson An ideal model Apr 18, 2019 at 11:48
• @HandyHowie it isn’t a real battery but if it were would I just be able to find it on the battery itself? Apr 18, 2019 at 11:50
• On the datasheet possibly - data.energizer.com/pdfs/nh22-175.pdf Apr 18, 2019 at 12:02