LOCKERBIE ACADEMY PHYSICS DEPT

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Presentation transcript:

LOCKERBIE ACADEMY PHYSICS DEPT National 5 PHYSICS ELECTRICITY & ELECTRONICS

LOCKERBIE ACADEMY PHYSICS DEPT Ways to work out voltage divider circuits. Follow the plan below:

LOCKERBIE ACADEMY PHYSICS DEPT 1. Identify the component (the input device) 2. Set the conditions 3. Decide what happens to the resistance Work out the effect of the voltage across the component 5. Find the effect on Vout 6. Find the effect on the transistor (include the magic number) 7. Find the effect on the output device

LOCKERBIE ACADEMY PHYSICS DEPT V Vs 0V

M V Vs 0V 1. Identify the component LDR

M V Vs 0V 2. Set the conditions As light increases

As light increases RESISTANCE decreases M V Vs 0V 3. Decide what happens to the resistance As light increases RESISTANCE decreases

As resistance decreases voltage across the LDR decreases M V Vs 0V Work out the effect of the voltage across the component As resistance decreases voltage across the LDR decreases

As VLDR decreases Vout increases as they are not the same Vs 0V 5. Find the effect on Vout As VLDR decreases Vout increases as they are not the same

M V Vs 0V 6. Find the effect on the transistor (include the magic number) As Vout increases the voltage will increase above 0.7V (the magic number), the transistor will switch on current will flow between the emitter and collector and the motor will be on.

M V Vs 0V 7. Find the effect on the output device Current will flow between the emitter and collector and the motor will be on.

M V Vs 0V 1. Identify the component 2. Set the conditions 3. Decide what happens to the resistance Work out the effect of the voltage across the component 5. Find the effect on Vout 6. Find the effect on the transistor (include the magic number) 7. Find the effect on the output device

As light increases RESISTANCE decreases How this circuit works LDR M V Vs 0V As light increases RESISTANCE decreases Voltage across the LDR decreases As VLDR decrease Vout increases as they are not the same As Vout increases the voltage will increase above 0.7V (the magic number), the transistor will switch on. Charge will flow between the emitter and collector and the motor will be on

Now try this one yourself Vs 0V V t

Other TRANSISTORS N-channel enhancement MOSFETS work in a similar way but the SWITCHING VOLTAGE is 1.8V

Past Paper Q