Calculate EMF: 3.25 ohm, 440 mH, 3.00 A, 3.60 A/s

  • Thread starter Shackleford
  • Start date
In summary, the potential decrease across the coil at this moment can be calculated using the equation emf = - L dI/dt. In this case, we have a coil with 3.25 ohm resistance and 440 mH inductance, and a current of 3.00 A increasing at a rate of 3.60 A/s. By plugging in the values, we can find the emf across the coil. Sorry for the previous error, as I was not feeling well.
  • #1
Shackleford
1,656
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A coil has a 3.25 ohm resistance and 440 mH inductance. If the current is 3.00 A and is increasing at a rate of 3.60 A/s, what is the potential decrease across the coil at this moment?

The only equation I know to use is

emf = - L dI/dt
 
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  • #2
Hi Shackleford,

Shackleford said:
A coil has a 3.25 ohm resistance and 440 mH inductance. If the current is 3.00 A and is increasing at a rate of 3.60 A/s, what is the potential decrease across the coil at this moment?

The only equation I know to use is

emf = - L dI/dt

What would be the emf across a 3.25 ohm resistor in this situation?
 
  • #3
alphysicist said:
Hi Shackleford,



What would be the emf across a 3.25 ohm resistor in this situation?

Hello. Sorry. I took another quick stab at this problem and solved it correctly. I've kind of had a cold/mild flu lately.
 

1. What is EMF?

EMF stands for electromotive force and is a measure of the electrical energy produced by a source, such as a battery or generator.

2. How do you calculate EMF?

EMF can be calculated using the formula EMF = I x R, where I is the current (in amperes) and R is the resistance (in ohms).

3. What are the units for EMF?

The units for EMF are volts, which is equivalent to joules per coulomb.

4. What are the values for R, I, and dI/dt in this calculation?

In this calculation, R is 3.25 ohms, I is 3.00 A, and dI/dt is 3.60 A/s.

5. What is the significance of the value for dI/dt?

The value for dI/dt represents the rate of change of current, or how quickly the current is increasing or decreasing over time. This is important in calculating the EMF as it affects the strength of the electrical energy produced.

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