HomeworkLib
Question

Current and Ohm's Law ?

(a)

A lightbulb has a resistance of 210 Ω when operating with a potential difference of 125 V across it. What is the current in the lightbulb (in mA)?

 Correct: Your answer is correct. mA

(b)

What If? What would be the current in the lightbulb (in mA) if it were used in Peru, where the potential difference across it would be 220 V?

 Incorrect: Your answer is incorrect. mA


physics   Electricity-And-Magnetism   Ohm-s-Law   Current   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Request Professional Answer

Request Answer!

We need at least 10 more requests to produce the answer.

0 / 10 have requested this problem solution

The more requests, the faster the answer.

Request! (Login Required)

All students who have requested the answer will be notified once they are available.
Know the answer?
Add Answer to:
Current and Ohm's Law ?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Similar Homework Help Questions

  • (a) A lightbulb has a resistance of 165 Ω when operating with a potential difference of...

    (a) A lightbulb has a resistance of 165 Ω when operating with a potential difference of 115 V across it. What is the current in the lightbulb (in mA)? mA (b) What If? What would be the current in the lightbulb (in mA) if it were used in Japan, where the potential difference across it would be 100 V? mA

  • a) A lightbulb has a resistance of 190 Ω when operating with a potential difference of...

    a) A lightbulb has a resistance of 190 Ω when operating with a potential difference of 115 V across it. What is the current in the lightbulb (in mA)? ________mA (b) What If? What would be the current in the lightbulb (in mA) if it were used in Nigeria, where the potential difference across it would be 240 V? ________mA

  • 1. An aluminum wire having a cross-sectional area equal to 3.50 10-6 m2 carries a current...

    1. An aluminum wire having a cross-sectional area equal to 3.50 10-6 m2 carries a current of 6.50 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. 0.000193452 Incorrect: Your answer is incorrect. The equation for the drift velocity includes the number of charge carriers per volume, which in this case is equal to the number of atoms per volume. How...

  • 2. -/1 points SerPSE9 27.P.014.WI. A lightbulb has a resistance of 200 n when operating with...

    2. -/1 points SerPSE9 27.P.014.WI. A lightbulb has a resistance of 200 n when operating with a potential deference of 160 V across it. What is the current in the lightbulb? MA

  • Pre-lab EM-5 Ohm's Law and Kirchhoff's Rules Ohm's Law The resistance R of a device can...

    Pre-lab EM-5 Ohm's Law and Kirchhoff's Rules Ohm's Law The resistance R of a device can be determined by either directly measuring the resistance using an ohmmeter, or by measuring the current I through it and the voltage Vacross it, and then calculating R using Ohm's Law V R= (1) If the voltage across a resistor is 10V, and the current passing through it is 2.5 mA. of the resistor? What is the resistance R= Ω. Kirchhoffs Loop Rule Around...

  • PART A: A voltage of 18.0V across the terminals of a device produces a current of...

    PART A: A voltage of 18.0V across the terminals of a device produces a current of 3.00 mA through the device. What is the resistance of the device? Express your answer in kilohms to three significant figures. PART B: An old battery with an emf of 8.4 V has a terminal voltage of 8.0 V when it is supplying a current of 2.0 mA. What is the internal resistance of the battery? Express your answer in ohms as an integer....

  • Part A : The resistance of an electric heater is 90 Ω when connected to 120...

    Part A : The resistance of an electric heater is 90 Ω when connected to 120 V. How much energy does it use during 15 min of operation? (answer in J) Part B : The lightbulb used in a computer projector has a resistance of 71 Ω. What is the current through the bulb when it is operating on 120 V? ( answer in A )

  • An automobile battery has an emf of 12.6 V and an internal resistance of 0.0710 Ω....

    An automobile battery has an emf of 12.6 V and an internal resistance of 0.0710 Ω. The headlights together have an equivalent resistance of 7.50 Ω (assumed constant). (a) What is the potential difference across the headlight bulbs when they are the only load on the battery? (Enter your answer to at least two decimal places.) 12.48 V (b) What is the potential difference across the headlight bulbs when the starter motor is operated, with 35.0 A of current in...

  • Exercise 2. An instrument used to measure current is called an ammeter. The ammeter is connected...

    Exercise 2. An instrument used to measure current is called an ammeter. The ammeter is connected into a circuit in series in the loop in which the desired current reading is required. The resistance of an ideal ammeter is zero, and it is essential in real ammeters that the resistance of the instrument be very small compared to other resistances in the circuit. Why? R2 Ri a)-A meter to measure potential difference is called a voltmeter. To find the potential...

  • I need the answers to these ten questions. I have attached them below. Please answer them...

    I need the answers to these ten questions. I have attached them below. Please answer them all. Many many thanks in advance!! When a torch is brought 2 times closer, how many times brighter will it appear? O 16 A diffraction grating that contains 650472 lines/m is illuminated by monochromatic light (λ-632.8 nm) from a helium-neon laser directed perpendicular to the surface of the grating. What is the angle for the second order maxima to occur? 24° O 45 48...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT