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13 Cards in this Set
- Front
- Back
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what is the frequency and voltage of mains electricity? |
50Hz 230V |
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What are the colours of live, neutral and earth wires? |
live = brown neutral = blue earth =green&yellow stripeswhat are units for |
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What are the units for power, current, potential difference, and resistance? |
watts (W), amps (A), volts (V), ohms (🧲) |
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hy is the current provided by a cell called a direct irrent (d.c.)? |
only flows in one direction |
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How does a material become charged? |
becomes negatively charged by gaining electrons an
becomes positively charged by losing electrons |
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What units are charge, current, and time measured in? |
coulombs (C), amperes (A), seconds (s) respectively |
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What is the same at all points when charge flows in a closed loop? |
current |
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What must there be in a closed circuit so that electrical charge can flow? |
source of potential difference |
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What happens to the current if the resistance is increased but the p.d. stays the same? |
current decreases |
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What is an ohmic conductor |
conductor where current is directly proportional to the voltage so resistance is constant (at constant imperature) |
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What happens to the resistance of a filament lamp as its temperature increases? |
resistance increases |
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What happens to the resistance of a thermistor as its temperature increases? |
resistance decreases |
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What happens to the resistance of a light-dependent resistor when light intensity increases? |
resistance decreases |
