As blower motor speed decreases, what happens to the voltage drop across the resistance block?

When the blower motor speed decreases, the resistance in the circuit remains constant, but the current flowing through it changes due to the motor's operational demands. According to Ohm's Law, which states that voltage (V) is equal to current (I) times resistance (R), a decrease in motor speed results in a decrease in current.

In a typical blower motor setup, a resistor block is used to control the speed by creating a voltage drop across it. As the blower motor speed decreases, the current passing through the resistor also decreases. Since the resistance value is constant, a lower current results in a lower voltage drop across the resistance block.

Thus, as the blower motor speed decreases, the voltage drop across the resistance block actually increases, aligning with the fact that the overall system operates with the parameters of the circuit adjusting based on the load and speed of the motor. As the blower operates at lower speeds, the voltage required to push the current through the resistance increases in relation to the reduced demand from the blower, illustrating the dynamic nature of electrical systems.

This reinforces the principle that while the motor's speed is tied to the performance and efficiency of the overall circuit, the relationship between voltage, current, and resistance is governed by fundamental electrical laws