1-a coffee-maker contains a heating element that has a resistance of 53 . This h

Question

1-a coffee-maker contains a heating element that has a resistance of 53 . This heating element is energized by a 120-V outlet. What is the current in the heating element?

2-The heating element in an iron has a resistance of 28 . The iron is plugged into a 120-V outlet. What is the power delivered to the iron?

3-A 1.34- resistor is connected across a 8.20-V battery. The voltage between the terminals of the battery is observed to be only 7.80 V. Find the internal resistance of the battery.
________

Explanation / Answer

1)   BY V = iR
=>i = V/R = 120/53 = 2.26 amp

2) P = V^2/R = 120^2/28 = 514.3 W

3) The voltage drop across the internal resistance is 8.2 - 7.8 = 0.4 V.

The current drawn from the battery is 7.8/1.34 =5.82 A;

The internal resistance is then V/I = 0.4/5.82 = 0.07 ohms

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.