The formula PT = ET × IT determines the total power consumption of the circuit when ... and ... are known.

The formula PT = ET × IT determines the total power consumption of the circuit when ... and ... are known.

• A. Amps / Volts
• B. Amps / Watts
• C. Volts / Watts
• D. Watts / Ohms

Answer: (B)

The main idea is that power in a DC circuit comes from multiplying voltage by current. In the formula PT = ET × IT, ET represents voltage (the potential difference) and IT represents current (the flow of charge). When you multiply volts by amps, you get watts, which is the total power consumed. So the quantities you need to know are Amps and Volts—their product gives power in watts. That’s why the correct pairing is Amps and Volts: you multiply current by voltage to get power. Using Amps and Watts or Volts and Watts wouldn’t let you form the required product from the given equation, and Watts and Ohms don’t directly supply both voltage and current to compute power.

The main idea is that power in a DC circuit comes from multiplying voltage by current. In the formula PT = ET × IT, ET represents voltage (the potential difference) and IT represents current (the flow of charge). When you multiply volts by amps, you get watts, which is the total power consumed. So the quantities you need to know are Amps and Volts—their product gives power in watts.

That’s why the correct pairing is Amps and Volts: you multiply current by voltage to get power. Using Amps and Watts or Volts and Watts wouldn’t let you form the required product from the given equation, and Watts and Ohms don’t directly supply both voltage and current to compute power.