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5.5 The potential divider 5.5 The potential divider 3V 6V 3V 5.5 The potential divider 5.5 The potential divider 5.5 The potential divider 5.5 The potential divider I 5.5 The potential divider I 5.5 The potential divider I 5.5 The potential divider I 5.5 The potential divider I 5.5 The potential divider I To supply a variable pd: Terminal pd = 2.0 V A simple volume control AC Audio input 2V / 100cm 0.02 V / cm Variable voltage output to a loud speaker To supply a variable pd: Terminal pd = 2.0 V A simple volume control AC Audio input 2V / 100cm 0.02 V / cm Variable voltage output to a loud speaker mA To supply a variable pd: 2V / 100cm Terminal pd = 2.0 V A simple volume control AC Audio input 0.02 V / cm Cell X Variable voltage output to a loud speaker mA If the mA meter reads zero at 60cm along the wire, What is the emf of the unknown cell X? To supply a variable pd: 2V / 100cm Terminal pd = 2.0 V A simple volume control AC Audio input 0.02 V / cm Cell X Variable voltage output to a loud speaker mA If the mA meter reads zero at 60cm along the wire, What is the emf of the unknown cell X? 60 cm at 0.02 V/cm = To supply a variable pd: 2V / 100cm Terminal pd = 2.0 V A simple volume control AC Audio input 0.02 V / cm Cell X Variable voltage output to a loud speaker mA If the mA meter reads zero at 60cm along the wire, What is the emf of the unknown cell X? 60 cm at 0.02 V/cm = 1.2 V To supply a variable pd: A simple volume control AC Audio input AC Audio input Variable voltage output to a loud speaker 5.5 The potential divider The current through the bulb can be reduced to zero In this circuit 5.5 The Sensor potential circuits: divider Adjust the variable resistor To obtain a suitable output voltage Vout Vout 5.5 The Sensor potential circuits: divider Adjust the variable resistor To obtain a suitable output voltage Vout Vout If the temp falls then.. * the resistance of the thermistor rises * pd across the thermistor rises 5.5 The Sensor potential circuits: divider Adjust the variable resistor To obtain a suitable output voltage Vout Vout If the temp falls then.. * the resistance of the thermistor rises * pd across the thermistor rises 5.5 The Sensor potential circuits: divider Adjust the variable resistor To obtain a suitable output voltage Vout Vout 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 5.5 The potential divider
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