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Electricity

Chapter 34

QuestionAnswer
What is current The flow of electrons in a wire
To make a simple circuit you need A Battery , a bulb and some wires
Insulators substances that do not allow electricity to travel through them
Conductors substances that allow electricity through them
To measure current use an ammeter
Current is measured in units called Amps
The symbol for current is I
Bulbs in series are connected one after the other in the circuit
Bulbs in paralled are connected in separate circuits opposite each other
if one bulb blows in a series circuit they all go out
A battery pushes current through the wires
Voltage is also called Potential difference
Voltage is measured in Volts
the symbol for a battery is a long line followed by a short line. the long line represents this end of the battery.. positive
Resistance is the amount by which a wire tries to stop current going through it
Resistance is measured using a device called an ohmmeter
units of resistance are ohms
There are two types of resistor Fixed and variable
ohms law states that V/I = R
a diode is a device that allows current to flow through in one direction only
light emitting diodes are used instead of bulbs because they use very little electricity
LDR stands for Light dependent resistor
a thermistor is a device made of material that reduces its resistance when the temperature of the device changes
Power is the rate at which work is done
Created by: PDervin
 

 



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