Final answer:
To perform a voltage drop test on a blower motor, connect a voltmeter across its terminals. This allows measurement of the voltage drop due to the motor's resistance during operation. The correct option is to connect a voltmeter to measure voltage, as Ohm's law relates voltage, current, and resistance. Option 1) ) Connect a voltmeter across the terminals of the Blower motor and measure the voltage is the correct answer.
Step-by-step explanation:
To perform a voltage drop test on a blower motor, you should connect a voltmeter across the terminals of the motor and measure the voltage while the motor is running. This is because a voltmeter is designed to measure the potential difference between two points in an electrical circuit without altering the current flow. By doing this, you can determine the voltage drop that occurs as a result of the blower motor's resistance when current is passing through it. Therefore, the correct option is 1) Connect a voltmeter across the terminals of the Blower motor and measure the voltage.
According to Ohm's law, the formula for the voltage drop across a resistor is V = IR, where 'V' is the voltage drop, 'I' is the current flow in amperes, and 'R' is the resistance in ohms. Ohm's law allows us to understand that the voltage drop is directly proportional to the current flowing through the motor and its resistance. This is essential in automotive applications, where small increases in resistance due to factors like corrosion can lead to significant voltage drops, potentially causing problems with the proper operation of the vehicle's electrical components.
For example, if a starter motor has an equivalent resistance of 0.0500 ohms and the battery supplying the motor has an internal resistance of 0.0100 ohms, we can calculate the current delivered to the motor (a) and the voltage applied to it (b) using the formula I = V / (R + r), where 'V' is the battery's voltage, 'R' is the motor's resistance, and 'r' is the internal resistance of the battery. Moreover, the power supplied to the motor (c) can be calculated using P = Vapplied x I. If battery connections become corroded, adding another 0.0900 ohms of resistance (d), similar calculations can show how this additional resistance significantly impacts the current flow, voltage, and power supplied to the motor.