Physics n00b Problem - Power Conversion

1. Sep 13, 2005

Seraph

Power Conversion (Amps & Voltage)

What exactly is Power Conversion in relation to Voltage and Current?

Last edited: Sep 13, 2005
2. Sep 13, 2005

FluxCapacitator

If you mean, what's the power in a circuit, then the equation is:

$$P=IV$$ ,where P is power, I is current, and V is voltage.

Using V=IR, you can convert that to whatever you need.

3. Sep 13, 2005

Seraph

Well the question I have is as follows:

"A torch bulb has 3V; 0.5A written on the packet.

Calculate the power conversion for the bulb in normal use."

So do I need to use the formula - see I'm unsure with the units. Would the answer therefore be 1.5 something?

4. Sep 13, 2005

Seraph

Can Anyone Help?

5. Sep 14, 2005

Galileo

V is measured in J/C, I in C/s, so IV in (J/C)(C/s)=J/s=W or Watts.

6. Sep 14, 2005

Seraph

k thanks alot