Unit 4 Week 4 In Class Activity_Ortiz

docx

School

ECPI University, Virginia Beach *

*We aren’t endorsed by this school

Course

120L

Subject

Electrical Engineering

Date

Feb 20, 2024

Type

docx

Pages

4

Uploaded by Rodevlinder

Report
Name: ___________________ Unit 4 Class 1 Unit 4 Week 4 In Class Activity Due at end of class. Instructions and help will be provided in class. What is the standard unit of charge called? Coulomb (C) Write Coulomb’s Law below and indicate what units each variable must be in to get an answer in Newton’s. F = k x Q 1 x Q 2 /d 2 ___________________________________________ q 1 q 2 in units of coulombs d in units of meter F in units of newtons 1) What is the force between a positive charge of 4 x 10 –6 C and a negative charge of 6 x 10 –6 C if they are 0.75 cm from each other? F = 3,840 N Is this an attractive or repulsive force? Attractive 2) A charge of 5x10 -5 C exerts a force of 12.5 N on a charge of 4x10 -5 C, how far apart are the charges? d = 1.2m 1
Name: ___________________ Unit 4 Class 1 Write Ohm’s Law in two versions below. I = VV/R = I Rx = RV/I Write what the variable stands for and the Standard Units used: V stands for voltage Units volt I stands for current Units R stands for resist Units 3) If an electric motor operates with a voltage of 12 V and has a resistance of 2.5 Ω, how much current does it draw? I = V/R = 12/2.5 = 4.8 A 4) If a flashlight has bulb with a resistance of 7.5 Ω and draws current of 2.5 A, what is the voltage? V = 18.75v 5) When 12 V sends 5 A of current through a resistor, what is its resistance? R = 2.4 ohm What is the rule for equivalent resistance when resisters are connected in series? R 1+ R 2+ R 3 = R total ____________________________________ 2
Name: ___________________ Unit 4 Class 1 6) Three resistors of 80 ohms, 120 ohms, and 40 ohms are connected in series with a 12.0-V battery. A) Find the total resistance of the circuit. R total = 240 ohm B) Find the current in Part A I = 0.05A 7) Use the following circuit for this problem: A) What is the current through the top resistor? I = 1A B) What is the current through the bottom resistor? I = 2A C) What is the total current in the circuit? I = 3A D) What is the equivalent resistance of the circuit? R = 6.7ohm Write the Power Law P = IxV _____________________________ 8) An electric skillet runs at 125 V and draws 16 A of current. What power does it use? P = 2000W 3
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help
Name: ___________________ Unit 4 Class 1 9) How much power does a device use if it runs on 16 V and draws 2.5 A current? P = 40W 10) How much energy does a device use if it is rated at 800 W and runs for 30 minutes? E = 1440000J = 1440Kj Convert this to the unit of kWhr, the amount of energy used at 1000 W for 1 hour. 800Wx0.5h = 400W/h = 0.4kW/h If electricity costs $0.10 per Kwhr, how much does it cost to run the device in the first part of this problem for the time indicated? 0.4kW/h x $0.1. $0.04 = 4 cents 4