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;
18 Cards in this Set
- Front
- Back
What is current |
Current is amount of charge flowing per second |
|
What is current measured in? |
Amps (use an ammeter) |
|
What is resistance |
Resistance prevents charge from flowing |
|
How is resistance caused |
It’s caused by the atoms in the conductor |
|
What is potential difference? |
The push that causes charge to flow. PD also tells us how much energy is being transferred |
|
What’s PD measured with |
A voltmeter |
|
Whichcharges attract and which charges repel |
Opposite attract, Like charges repel |
|
How do you charge an insulator |
By rubbing two together, as they run electrons are transfer from one insulator the the other |
|
How do you charge an insulator |
By rubbing two together, as they run electrons are transfer from one insulator the the other |
|
What’s the calculation for resistance |
R= V/ i
R measured in Ohms V in volts i In amps
*note i should be a capital |
|
What is shared and what is the same in a series circuit |
Current is the same everywhere PD of battery is shared between components |
|
What is shared and what is the same everywhere in a parallel circuit |
Current splits at junction, PD across each loop is equal to PD of the battery |
|
What poles attract and repel |
Back (Definition) |
|
What is magnetic field |
Area around a magnet where a force is exerted on other magnetic materials |
|
Where is force strongest |
Strongest where field lines are close, weak where field lines are apart |
|
What is an electromagnet |
A temporary magnet created by passing an electric current through a coil of a wire |
|
What is an electromagnet |
A temporary magnet created by passing an electric current through a coil of a wire |
|
Name 2 ways of making an electromagnet stronger |
1 Add a magnetic core (iron nail etc) 2 increase number of coils 3 Increase current |