# Basic electronics

• posted

in a resistive circuit.

No - E = I/R

No. The current depends on the resistance, as well as the voltage.

I suspect that your 4.8 V batteries have a _capacity_ of 720 mA-hours or 1200 mA-hours. That is, they could theoretically deliver 720 mA (or 1200 mA) for an hour before becoming fully discharged.

Yes - but it won't run it for long.

```--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca        ```
• posted

Ummmmm...Peter?.....:-)

Bob M.

• posted

Obviously, he meant conductance, not resistance, in that post. ;-)

• posted

Hi,

Current is directly proportional to Voltage. E=I

There for I=E, E=9V, I=9A ?

If this is so, how come you can get a 4.8 V battery in 720 mA and in

1200 mA ?

Would this 4.8 battery allow you to connect to a device that required a

Thanks.

• posted

Proportional does not mean equal. Resistance is the constant of proportionality:

E = IR or I =E/R

Are you quoting maximum current (mA) or capacity in milliamp-hours (mAh) there?

Possibly, yes. What sort of battery is it? Can you post a link to the spec?

The capacity (= stored charge = current * time) determines how long it will last.

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