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17 Cards in this Set
- Front
- Back
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What is the formula for power? |
Power = Current x Voltage |
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Name the three wires found in a plug socket, and state their colours. |
Earth wire- green and yellow Neutral wire- blue Live wire- brown |
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What is the formula for Energy? |
Energy= Watts x time |
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What happens when two different materials rub together? |
They become electrically charged by friction. |
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Name the three types of resistors that can be found on a circuit (excluding a basic resistor.) |
LDR (light dependant resistor), thermistor and a variable resistor |
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Describe the differences between a series and parallel circuit. |
Series circuit- one switch will always turn off all components If component breaks in series circuit the whole circuit will stop (break in circuit) Series: current is the same throughout circuit and voltage is shared between components Parallel: current splits through branches but the voltage is the same |
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What is the function of a diode? |
Allows current to flow in one direction only. |
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What is the formula for Ohm's law? What is measured in Ohms? |
Voltage = Current x Resistance Ohms are a measure of resistance. |
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What way does current go round a circuit? |
Positive to negative |
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What are the 5 risks of plugs/cables? |
-Trip hazard -Metal in the wall socket could conduct electricity -Cable fray -Water near electricity -Damage to plastic insulating case |
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Name 3 good conductors and 3 good insulators. |
Copper, silver gold Plastic, rubber, glass |
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Name two safety features of circuits. |
Fuse Circuit breaker in switchboard |
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Explain what ammeters and voltmeters do. Where do they go in the circuit? |
Ammeters go in the circuit and measure how many coulombs of charge are passing through every second. Voltmeters go parallel to a component and measure the voltage across said component. |
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What is the equation for charge? (Coulombs) |
Charge = current x time |
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What are LEDs? |
Light emitting diodes (they light when current flows through them) |
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Describe static electricity. |
-Static charges can be produced by the action of friction on an insulator -Objects are charged positive by the loss of electrons and vice versa -Only electrons move |
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Give a use of static electricity. |
Electric pain sprayer: -positive paint covers negatively charged (car framework) only and therefore only paints designated areas
Photocopiers Electrostatic precipitators
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