Transformers Flashcards
(12 cards)
What is a transformer made out of?
Two inductors next to each other but not touching. These both have a core.
The current coming in is the primary current, the current coming out is the secondary current.
Essentially it passed electric current between to electrical magnetic fields
What is Electromagnetic induction?
When primary current is passed to secondary current
What happens if the primary current coil and secondary coil are the same?
You get the same current output
What is a step down transformed?
Secondary coil has less coils giving you less current output
if half as many coils, that’s half the current
secondary voltage divided by the primary voltage = the number of turns on the secondary coil / turns on the primary coil
How do you calculate How much a current will be stepped down?
secondary voltage divided by the primary voltage =
the number of turns on the secondary coil / turns on the primary coil
=
I in/ I out
vout/vin = Ns/Np (ns = number secondary / number primary)
If current on primary is higher that the current on the secondary, what is the voltage on the secondary?
The secondary will have more voltage
Power out = Power in still
What is a step up transformer
Come on now, it’s the opposite of a step-down
What does the coil with the most turns have the higher amount of?
What does the coil with the least turns have the higher amount of
More coils = High voltage, low current
Less coils = Low voltage, High current
What is an Isolation transformer?
Coils have the same amount of turns
Breaks a circuit into a primary and secondary which keeps DC noise from getting through. Prevents capacitance build up from high noise.
Prevents conditional ground connection between primary and secondary which prevents high voltage discharge.
Why does electricity flow more efficiently at a higher voltage?
Electrons shift around a wire creating lots of lost energy which heats up wires.
The higher the voltage and lower the current, the lower energy is wasted in this way.
What is the power loss if you have 1000V being transmitted at 1ohm of resistance/reactance
This will be at 100kW
100kw/1000V = 100A
Copper loss in the inductor = 100 squared * 1 = 10000W = 10kW
I squared * R
What is the power loss if you have 10,000V being transmitted at 1ohm of resistance/reactance
This will be at 100kW
100kW/10,000V = 10A
10 squared * 1 = 100W = 0.1kW
I squared * R
