# Electromagnetic coil and capacitors vs resistance

In summary, the formulas for calculating energy stored in electromagnetic coils and capacitors are similar, with the only difference being the absence of 0.5 in the formula for resistance. This is because resistance does not store energy, but rather uses it. The formula for resistance is U=RI2, while for coils and capacitors it is U=0.5LI2 and U=0.5CV2 respectively. These similarities are merely coincidences and do not indicate a specific relationship between the different components.

I'm not really sure if this is even scientific but while calculating how much energy is stored in electromagnetic coils and capacitors, pretty much the same formula is used:
For electromagnetic coils it's U=0.5LI2
For capacitors it's U=0.5CV2
Why I think they're the same is that in a sense L to coils is sort of the same as C to capacitors. Same goes for V and I
The formula used for resistance is pretty much the same( well resistance doesn't store energy, uses it) with a slight difference which is there's no 0.5
U=RI2
Why don't we have the same pattern for resistance? Are these formulas even realevant?

Why would you expect them to be the same? As you said, R does not store energy. and ##RI^2## is not energy it is power. See my signature below.

sophiecentaur
anorlunda said:
Why would you expect them to be the same? As you said, R does not store energy. and ##RI^2## is not energy it is power. See my signature below.
So energy for resistance is actually U= RIq?
But what about coils and capacitors? Are those actually the same formula adjusted for coils and capacitors? If so, what is the mother formula. Cause the conserved energy in movement shows the same pattern of K=0.5mV2 which you could say that mass to an object is sort of like L to coils and C to capacitors
Too many questions, sorry :)

So energy for resistance is actually U= RIq?
a

No, the energy lost in a resistance is ##\int RI^2\, dt## Or, if the power P is constant for a time T, then energy is P times T.

For the others, just consider the similarities in form of the equations to be coincidences.

anorlunda said:
a

No, the energy lost in a resistance is ##\int RI^2\, dt## Or, if the power P is constant for a time T, then energy is P times T.

For the others, just consider the similarities in form of the equations to be coincidences.

Ohhhh Thank you

anorlunda

## 1. What is an electromagnetic coil?

An electromagnetic coil is a conducting wire wound into a spiral or helix shape. When an electric current flows through the coil, it creates a magnetic field around the coil.

## 2. What is the purpose of capacitors in relation to resistance?

Capacitors are used in electronic circuits to store and release electrical energy. They can work together with resistance to control the flow of current in a circuit.

## 3. How do electromagnetic coils and capacitors differ from resistance?

Electromagnetic coils and capacitors affect the flow of current in a circuit by storing and releasing energy, while resistance limits the amount of current that can flow through a circuit.

## 4. What are some common uses of electromagnetic coils and capacitors?

Electromagnetic coils are commonly used in motors, generators, and transformers to convert electrical energy into mechanical energy and vice versa. Capacitors are used in filters, oscillators, and power supplies to regulate and stabilize current.

## 5. How do electromagnetic coils and capacitors affect the circuit's frequency?

Electromagnetic coils and capacitors can work together to form resonant circuits, which can amplify certain frequencies while attenuating others. This can be useful in radio and communication systems.