Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
How does a transformer work |
When AC is in the primary coil, it produces an alternating magnetic field. The lies of alternating magnetic field pas through the secondary coil and induces voltage in it. |
|
What happens if the lamp is connected to the secondary coil |
This is because the induced voltage causes a current in the secondary coil. So the lamp lights up. Why rors |
|
Why doesn’t a transformer work with an DC |
This is because To make a transformer work we need an AC to induce pd while a DC produces a constany magnetic field |
|
Formula of transformer |
Back (Definition) |
|
Difference between a step up and step down transformer |
Back (Definition) |
|
Construct a transformer device |
Back (Definition) |
|
What’s an electricity grid |
Is the network of cables and transformer used to distribute electricity in our homes and other building from power stations |
|
Why electricity grids use high clvoltahe |
This is because cables waste energy due to resistances. Current in them as a heating effect. For this reason high voltages reduces the current through the cables and this reduces the amount of energy lost as heat. |
|
Equation when transformer are 100% |
Back (Definition) |
|
Advantage of high voltage transmission |
The higher pd, the greater the efficiency of transferring electrical power through the grid |