The document investigates how the voltage detected by an infrared receiver is affected by the input current to the infrared transmitter and the distance between the transmitter and receiver. The experiment used an IR533C infrared transmitter and FDS100 infrared receiver. The transmitter input current was varied using a potentiometer, and the detected voltage and input current were measured using voltmeters. Results showed that the detected voltage increased with higher transmitter input current and decreased with greater distance between transmitter and receiver. It was concluded that to transmit infrared signals over longer distances, the transmitter input current needs to be higher to ensure sufficient signal power.