Lesson 5 Quiz 5 How to calculate power in a DC parallel circuit

The correct formula for determining the total power consumption of a circuit directly when E (volts) and I(amperes) are known values, is: P= E/I

False

he correct formula for determining the total power consumption of a circuit directly when E (volts) and R(ohms) are known values, is: P= R/E

False

The amount of power used by each resistor can be found by using Ohm's law.

True

The formulas required to calculate the total circuit power in this circuit using the indirect method are:PR1 = I12 × R1,PR2 = I22 × R2,PT = PR1 + PR2 andPT = (I12 × R1) + (I22 × R2).

True

How much power is consumed by resistor R3 in the circuit? a. 58 W b. 84 W c. 112 W d. 196 W

a. 58W

The ? method is used to determine total power in a parallel circuit when that power is determined from the total current, total resistance, and total voltage of the circuit. a. direct b. equivalent c. indirect d. Law of Proportionality

a. direct

Two resistors of unequal value are connected in a circuit parallel with each other. The power dissipated by the resistor with the smaller ohm value will be ? the power dissipated by the resistor with the larger ohm value. a. greater than b. less than c. equal to d. twice than

a. greater than

Three lamps with wattages of 200 watts, 125 watts, and 75 watts are connected to a circuit in parallel. What is the total power consumed by the circuit when all lamps are operating? a. 133.3 W b. 400 W c. 500 W d. 4 kW

b. 400W

The total amount of power in a DC parallel circuit is equal to the sum of the ? used by all the parts of the circuit. a. current b. power c. resistance d. voltage

b. power

Find the total power that must be delivered by the voltage source in the circuit. a. 300 W b. 750 W c. 2,250 W d. 6,750 W

c. 2,250

How much power would be consumed in a parallel circuit that has a source voltage of 4,160 volts, and a total circuit current of 8.5 amperes? a. 489 W b. 3.536 kW c. 35,360 W d. 0.3536 MW

c. 35,360W

How many 40-watt lamps could be connected in parallel on a 15-ampere, 120-volt circuit without exceeding 80% of the current rating of the circuit? a. 10 b. 18 c. 36 d. 45

c. 36

In the circuit, what is the resistance of the 416-watt load in the circuit? a. 416 Ω b. 4.16 kΩ c. 41,600 Ω d. 416 kΩ

c. 41,600Ω

The ? method is used to determine total power in a parallel circuit from the sum of the individual power consumption of the loads in the circuit. a. direct b. equivalent c. indirect d. Law of Proportionality

c. indirect

Two resistors of equal value are connected in parallel with each other. The power dissipated by the two resistors will be equal to the ? . a. power dissipated in the largest resistor b. reciprocal value of the two resistors multiplied by the total current c. sum of the power dissipated by each resistor d. total current

c. sum of power dissipated by each resistor

A DC circuit with a 120-volt power supply contains three resistors in parallel. The resistors are 30 ohms, 40 ohms, and 50 ohms respectively. What is the total power consumed by all three resistors? a. 41.6 W b. 376 W c. 480 W d. 1,128 W

d. 1,128W

A circuit contains four 300-watt lamps connected in parallel across a 120-volt power source. How much power is consumed by the circuit? a. 75 W b. 300 W c. 360 W d. 1,200 W

d. 1,200 W

Two heaters are connected on the same 240-volt circuit. If the heaters draw 10 amperes of current each, how much total power is delivered to the heaters? a. 48 W b. 240 W c. 0.48 kW d. 4,800 W

d. 4,800W

The correct formula for determining the total power consumption of a circuit directly when I (amperes) and R(ohms) are known values, is Pt = I^2 x Rt

true