5014500
Description
Flashcards by megfindley, updated more than 1 year ago
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Created by megfindley
over 8 years ago
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| Question | Answer |
| What happens when insulating materials are rubbed against each other? | They become electrically charged. |
| What particle is rubbed off between each insulating material when they are rubbed together? | Electrons. (which have negative charges) |
| How does one of the insulating materials become negatively charged? | It gains electrons. (from the other insulating material) |
| How does one of the insulating materials become positively charged? | It loses electrons. (to the other insulating material) |
| If two electrically charged materials, which carry the same charge, are brought near to each other what will happen? | They will repel each other. |
| If two electrically charged materials, which carry different charges, are brought near to each other what will happen? | They will attract each other. |
| What is electric current? | The flow of electric charge. |
| What does this circuit symbol represent? | Open switch. |
| What does this circuit symbol represent? | Closed switch. |
| What does this circuit symbol represent? | Lamp. |
| What does this circuit symbol represent? | Fuse. |
| What does this circuit symbol represent? | Cell. |
| What does this circuit symbol represent? | Battery. |
| What does this circuit symbol represent? | Resistor. |
| What does this circuit symbol represent? | Voltmeter. |
| What does this circuit symbol represent? | Ammeter. |
| What does this circuit symbol represent? | Light dependant resistor. (LDR) |
| What does this circuit symbol represent? | Thermistor. |
| What does this circuit symbol represent? | Variable resistor. |
| What does this circuit symbol represent? | Diode. |
| Which component does this current-potential difference graph represent and why? | A filament bulb because the graph shows that the resistance of the filament bulb increases as the temperature of the bulb increases. |
| What component does this graph represent and why? | A diode, because it shows current only flowing in one direction, the diode has a very high resistance in the reverse direction. |
| What are mains electricity cables made from and why? | The outside layer is made from plastic because it is a good, flexible insulator. The two or three wires inside are made from copper as they are good conductors. |
| What colour is the neutral wire? | Blue. |
| What colour is the Earth wire? | Green and yellow stripes. |
| What colour is the live wire? | Brown. |
| What is direct current (d.c.)? | Current that always passes in the same direction. |
| What is alternating current (a.c.)? | Current which is constantly changing direction. |
| What is the frequency and potential difference of mains electricity? | 50 hertz and 230 V. (approx) |
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