Current is directly proportional to voltage (if the temperature is constant).

Voltage = current * restistance

To calculate total resistance of 2 resistors in a series circuit add them both together.

To calculate the total resistance of 2 resistors in a parallel circuit:

Total resistance = (R1 * R2) + (R1 + R2).

LDR - light dependent resistor. As light increases, resistance decreases.

Thermistor- temperature dependent resistor. As temperature increases, resistance decreases.

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