# Science - Electricity in the Home

 The flashcards below were created by user mshowley on FreezingBlue Flashcards. State the unit used to measure the units of electricity in the home Kilowatt hour (kW) State the pin that the brown wire is connected to in a plug Live State the pin that the blue wire is connected to in a plug Neutral State the pin that the green and yellow wire is connected to in a plug Earth Explain alternating current This means the electrons in the wire are constantly changing direction Explain direct current This means the electrons in the wire are flowing in one direction only What is a diode? This allows current to flow in one direction only When the positive end of the diode is connected to the positive end of the battery what happens? It is said to be in forward bias and this allows current to flow When the negative end of the diode is connected to the positive end of the battery what happens? It is said to be in reverse bias and no current flows What is an LED? This means light emitting diode It gives off light when current flows through it It is used to show if devices are on or off What is a thermistor? This is a device made of a material that reduces its resistance when the temperature of the device changes They are used as temperature sensors in fire alarms, ovens and fridges What is an LDR? This means light dependent resistor It is a variable resistor that changes resistance in response to light They are used as light meters in cameras and to turn on street lights When light is shone on an LDR does the resistance increase or decrease? It decreases State the function of a fuse This is a safety measure that if the current flowing through it is to high, the fuse wire melts breaking the circuit and cuts off the electricity Authormshowley ID152352 Card SetScience - Electricity in the Home DescriptionElectricity in the Home Updated2018-05-27T13:23:08Z Show Answers