Physics n00b Problem - Power Conversion

  • Thread starter Thread starter Seraph
  • Start date Start date
  • Tags Tags
    Physics Power
AI Thread Summary
Power conversion relates to the relationship between voltage (V), current (I), and power (P) in electrical circuits, defined by the equation P=IV. For a torch bulb rated at 3V and 0.5A, the power can be calculated by multiplying these values, resulting in 1.5 watts. The units confirm that voltage is in joules per coulomb, current in coulombs per second, leading to power measured in watts (joules per second). Understanding these conversions is crucial for accurately determining power usage in electrical devices. This knowledge is essential for anyone working with electrical circuits.
Seraph
Messages
4
Reaction score
0
Power Conversion (Amps & Voltage)

What exactly is Power Conversion in relation to Voltage and Current?
 
Last edited:
Physics news on Phys.org
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 alot
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Graphing the Power dissipated in a resistor
Replies
1
Views
2K
Understanding Back EMF in Electric Motors
Replies
19
Views
3K
Problem with the power of car
Replies
3
Views
873
Measurement technology textbook problems
Replies
2
Views
492
Fundamental electrokinetics problem calculation using Ohm's Law
Replies
4
Views
715
Voltage Drop in Parallel Receptacle Wiring
Replies
9
Views
2K
Measurement technology textbook problems
Replies
1
Views
605
Electronic power conversion design engineer making trouble...
Replies
4
Views
440
Solving Current & Power in 4 & 3 Wire Circuits
Replies
9
Views
2K
Worst-case power consumed by a circuit with MOSFETs
Replies
2
Views
957

Hot Threads

Recent Insights

Back
Top