5.5 The potential divider

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5.5 The potential divider

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AC Audio input Variable voltage output to a loud speaker A simple volume control Terminal pd = 2.0 V 2V / 100cm 0.02 V / cm To supply a variable pd:

AC Audio input Variable voltage output to a loud speaker A simple volume control 2V / 100cm 0.02 V / cm mA Terminal pd = 2.0 V To supply a variable pd:

AC Audio input Variable voltage output to a loud speaker A simple volume control 2V / 100cm 0.02 V / cm mA If the mA meter reads zero at 60cm along the wire, What is the emf of the unknown cell X? Cell X Terminal pd = 2.0 V To supply a variable pd:

AC Audio input Variable voltage output to a loud speaker A simple volume control 2V / 100cm 0.02 V / cm mA If the mA meter reads zero at 60cm along the wire, What is the emf of the unknown cell X? Cell X 60 cm at 0.02 V/cm = Terminal pd = 2.0 V To supply a variable pd:

AC Audio input Variable voltage output to a loud speaker A simple volume control 2V / 100cm 0.02 V / cm mA If the mA meter reads zero at 60cm along the wire, What is the emf of the unknown cell X? Cell X 60 cm at 0.02 V/cm =1.2 V Terminal pd = 2.0 V To supply a variable pd:

AC Audio input Variable voltage output to a loud speaker A simple volume control To supply a variable pd: AC Audio input

5.5 The potential divider The current through the bulb can be reduced to zero In this circuit

5.5 The potential dividerSensor circuits: Adjust the variable resistor To obtain a suitable output voltage V out

5.5 The potential dividerSensor circuits: Adjust the variable resistor To obtain a suitable output voltage V out If the temp falls then.. * the resistance of the thermistor rises * pd across the thermistor rises

5.5 The potential dividerSensor circuits: Adjust the variable resistor To obtain a suitable output voltage V out If the temp falls then.. * the resistance of the thermistor rises * pd across the thermistor rises

5.5 The potential dividerSensor circuits: Adjust the variable resistor To obtain a suitable output voltage V out If the temp falls then.. * the resistance of the thermistor rises * pd across the thermistor rises

5.5 The potential divider If the light intensity falls * the resistance of the LDR rises * pd across the the LDR rises

5.5 The potential divider If the light intensity falls * the resistance of the LDR rises * pd across the the LDR rises

5.5 The potential divider If the light intensity falls * the resistance of the LDR rises * pd across the the LDR rises

5.5 The potential divider