Calculate the current being drawn from a battery

In summary, the conversation is discussing how to calculate current from a battery using Ohm's Law. The participants are discussing the use of resistance and voltage in this calculation and suggest using Ohm's Law to simplify the process. They also mention the unit of measure for voltage and its symbol.
  • #1
qim
13
0
If I have a question asking to calculate the current being drawn from a battery can I, or rather should I, give an answer in Ohms?

I hate electricity...

Thanks and a Happy New Year to you all.

qim
 
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  • #2
Resistance is measured in ohms. Current is measured in amps.
 
  • #3
Hi Jim

Thanks, the penny is dropping...

I have been given the voltage and the resistances

So I guess I can work out the total resistance and then use P = V^2/R

and from there P = V/I > I = V/P

Just thinking aloud but I would be grateful if you could confirm that I am on the right track.

Thanks

qim
 
  • #4
Wouldn't it be easier to use Ohm's Law?

Doug
 
  • #5
Thanks Doug

"What's that?", you probably heard me say...

Yes, I got it, thanks very much.

qim
 
  • #6
Originally posted by qim
Hi Jim

Thanks, the penny is dropping...

I have been given the voltage and the resistances

So I guess I can work out the total resistance and then use P = V^2/R

and from there P = V/I > I = V/P

Just thinking aloud but I would be grateful if you could confirm that I am on the right track.

Thanks

qim


Actually, E is more commonly used to symbolize voltage. The unit of measure for voltage(E) is the Volt(V). E = 10V for example. Anyway,

[tex] P = E I [/tex]

So to calculate the current with a given Voltage and Power:

[tex] I = \frac{P}{E} [/tex]

You could save yourself a step and use

[tex] I = \frac{E}{R} [/tex]
 
Last edited:

1. How do you calculate the current being drawn from a battery?

The current being drawn from a battery can be calculated by dividing the voltage of the battery by the resistance in the circuit.

2. What is the unit of measurement for current drawn from a battery?

The unit of measurement for current is amperes (A) or milliamperes (mA).

3. Can the current drawn from a battery be higher than its capacity?

Yes, the current drawn from a battery can exceed its capacity, which can cause the battery to overheat and potentially damage it.

4. How does the current being drawn from a battery affect its lifespan?

The higher the current being drawn from a battery, the shorter its lifespan will be. This is because high currents can cause the battery to degrade and lose its capacity over time.

5. Is the current being drawn from a battery constant?

No, the current being drawn from a battery can vary depending on the resistance in the circuit and the voltage of the battery. It can also decrease over time as the battery's capacity decreases.

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