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Chapter 14
Revise Electronics
| Question | Answer |
|---|---|
| Why do you need a resistor in series with an LED in a circuit? | To limit the current to the LED. Otherwise it will burn out. |
| State the advantage of an LED over a light bulb | Far less energy used for the same level of light given off. |
| Give a definition for a LDR. | An LDR is a Light Dependent Resistor. It allows more or less current to flow depending on the amount of light shining on the LDR. |
| Give every day uses of an LDR. | They are used to turn street lights on at night and off during the day. |
| What is the function of a Diode. | A diode only lets electricity pass in one direction. The can be used to convert AC electricity to DC. |
| What is the function of a Resistor. | A resistor is used to limit the flow of current through a circuit. |
| What is the function of an LED (Light Emitting Diode). | An LED only allows electricity to flow in one direction and gives off light. |
| What is the function of an LDR (Light Dependent Resistor). | An LDR allows more or less current to flow depending on the amount of light shining on the LDR. |
| What is the function of a Speaker. | A speaker allows a circuit to make a sound or tune. |
| What is the function of an Incandescent Lamp (Bulb) | An incandescent lamp is used to give off light in a circuit. |
Created by:
SC Dave
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