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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 |