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Electricity
Revision of Current Electricity and Electricity in the Home chapters
Question | Answer |
---|---|
What are the units of voltage? | Volts |
What are the units of current? | Amperes (Amps) |
What are the units of resistance? | Ohms |
Name a device that can be used to measure voltage. | Voltmeter (Potentiometer) or Multimeter |
Name a device that is used to measure current. | Ammeter or Multimeter |
Name a device that is used to measure resistance. | Ohmmeter or Multimeter |
What is the relationship between voltage, current and resistance i.e. Ohms Law? | V = I x R |
What type of graph would you expect to see when investigating Ohm's Law? | Straight line through the origin |
Name the piece of equipment used to vary the current in the Ohm's Law experiment. | Rheostat (Variable Resistor) |
Name the three effects of an electric current. | Magnetic, Heating and Chemcial effect |
Give an everyday use of the magnetic effect of an electric current. | Electromagnet in a scrapyard |
Give an everyday use of the heating effect of an electric current. | Kettle, Toaster or Electric Heater |
Give an everyday use of the chemical effect of an electric current. | Electrolysis or electroplating |
If two bulbs are in series and another bulb is added in series, what would you observe? | Bulbs would get dimmer |
If two bulbs are in parallel and another bulb is added in parallel, what would you observe? | Bulbs are all same brightness |
If three bulbs are in series and one bulb is removed, what would you notice? | All the bulbs stop working |
What does A.C stand for? | Alternating Current |
What does D.C stand for? | Direct Current |
What does Direct Current mean? | The current flows in one direction only. |
What do you call substances that allow electric current to flow through them easily? | Conductors |
What do you call substances that do not allow electric current to flow through them easily? | Insulators |
What is the name of the brown wire in a plug? | Live Wire |
What colour is the neutral wire in a plug? | Blue |
What is the name of the green and yellow wire in a plug? | Earth |
Name the device in a plug that breaks the circuit if too much current is flowing through it. | The Fuse |
Which wire is always connected to the fuse in a plug? | Live |
Name the devices used in houses that can be reset if too much current flows and the power is turned off. | Circuit Breaker |