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# Chapter 14

### Revise Electronics

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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