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(Thermisotrs, Voltage, Graphs, Ohms law) - Coggle Diagram
Thermisotrs
Negavtive temperature coefficient (NTC), where the resistance decresaeces when the temperature is increased.
The resistance of a thermisorot decreases as the temperature increases, and the resistance increases when the temperature drops.
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A thermisotr can be used to switch on a heater when the theristor gets cold, or switch on a cooler when it gets too hot.
To do this, you need a potential divider circuit - this is an arrangment of two resistors, in series between terminals of the power supply. The PD of the power supply is known as the voltage in of the circuit. The voltage out is the voltage accross the bottom resistor (R2). The value of the voltage out will depened on the value of hte two resistors. The higher the resistance of R2 compared to R1, the higher the voltage out.
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Vout = Vin(R2/ R1 + R2) where R1+R2 is the total resistance. When R2 increases, the value of Vout will increase. When the voltage has increased enough, it can switch on a heater.
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Voltage
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It is teh difference in energy, carried by electrical charge, between 2 points in a circuit. E.g between teh positive and neagative terminals of a battery.
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Voltage is teh driving force for the flow of electric in the circuit, which is known as electric current.
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The bigger the PD, means the higher the current.
Volatage meaused in volts, using a voltmeter. It is connected in parellel to components in the circuit.
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