Physics n00b Problem - Power Conversion

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Homework Help Overview

The discussion revolves around the concept of power conversion in relation to voltage and current, specifically in the context of a torch bulb rated at 3V and 0.5A.

Discussion Character

  • Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between power, voltage, and current, with some attempting to clarify the formula for calculating power. Questions arise regarding the correct application of units and the specific calculation for the torch bulb.

Discussion Status

Some participants have provided insights into the formulas involved, while others express uncertainty about unit conversions and the calculation process. There is no explicit consensus on the approach to take, but guidance has been offered regarding the relationships between the variables.

Contextual Notes

Participants are navigating the definitions and units associated with power, voltage, and current, indicating a need for clarity on these concepts. The original poster expresses uncertainty about the calculation and units involved.

Seraph
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Power Conversion (Amps & Voltage)

What exactly is Power Conversion in relation to Voltage and Current?
 
Last edited:
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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.
 
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?
 
Can Anyone Help?
 
V is measured in J/C, I in C/s, so IV in (J/C)(C/s)=J/s=W or Watts.
 
k thanks a lot
 

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