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