Physics Worksheet Lesson 18 Electric Current

Physics WorksheetElectric CurrentDo Now: Water Flow vs. Electric Current Models:If an electric circuit consists of wires, a battery and a lightbulb, please compare the water flow in the following pictureto the electric current in a circuit:Section:Name:3. Draw a simple electric circuit using symbols of wires, abattery, and a light bulb. Then, overlay the three basicphysics quantities on the circuit.Measuring Voltage & Current4. We can measure the Voltage using ,and its symbol is:5. We can measure the Current using ,and its symbol is:Pump:Water pipe:Water Mill:Height:6. We can measure the Voltage, Current and Resistanceusing:.7. Draw a simple electric circuit using symbols. Then, addthe symbol of instruments in order to measure the voltageand current of the circuit.High PE Water:Low PE Water:Flow of Charge and Electric Circuits1. Draw a simple electric circuit using wires, a battery, and alight bulb, and draw the same circuit next to it usingsymbols of them.8. What is the Ohm’s Law:Formula:Ohm’s LawFormula:2. List the three basic physics quantities in an electric circuit,including their names, symbols, units, and symbols ofunits.Formula:Physical QuantitySymbolUnitSymbolof UnitGraph:VRelation:IMr. Lin1

Physics WorksheetElectric CurrentSection:Name:14. A 2.5-MΩ resistor has a 0.02-mA current in it. What isthe voltage across the resistor?IRelation:R15. A simple circuit uses a 9.0-V battery and uses 20KΩresistor, what’s the current of the circuit?VRelation:R9. What is the current through a 4-ohm resistor connected toa 12-V power supply?10. A 5-ohm resistor has a 8-A current in it. What is thevoltage across the resistor?16. A circuit uses a 12.0-V car battery and draws 0.5 A ofcurrent, what’s the resistance of the circuit?17. Find the current of the following electric circuit?20ΩI11. What is the resistance of a device that uses 2.5 A ofcurrent when connected to a 15-volt power source?9V18. Find the resistance of the following electric circuit?R12. What is the current through a 6-KΩ resistor connected toa 9-V power supply?0.2A3V19. Find the voltage of the following electric circuit?8KΩ13. What is the resistance of a device that uses 0.5 mA ofcurrent when connected to a 5-volt power source?0.4AVMr. Lin2

Physics WorksheetElectric CurrentSection:Name:27. How much current must there be in a circuit if 100coulombs flow past a point in the circuit in 4 seconds?Resistors20. A resistor is.21. Resistors are used to control ,since in an electric circuit, .28. If there is a current of 20 amperes in a circuit for 10minutes, what quantity of electric charge flows inthrough the circuit?Units of resistors are .22. What are the factors to determine the resistance?FactorSymbolUnit29. How much time is required for 10 coulombs of chargeto flow past a point if the rate of flow (current) is 2amperes?Formula of resistance:23. A 0.5-m long Nichrome wire has 0.001 m2 cross-section.What is the resistance of the wire?Voltage Sources30. A voltage source is:24. A 1.2 x 10 –5 Ω Copper wire has 0.004 m2 cross-section.What is the length of the wire?31. Voltage sources: .Units of Voltages are: .Electric Current25. Electric current is .1) In solid conductors: .2) In fluids: .32. The potential energy per coulomb of charge (V W / q) available to electrons moving between terminals is the(is also called theor emf).26. Direction of current:1) Electric (conventional) current: .2) Electron flow: .33. Examples of voltage source:Formula: .Units of electric current .Mr. Lin3

Physics WorksheetElectric CurrentBatteries in Parallel and in SeriesSection:Name:V or I34. Compare the following three cases:tIn North America AC is V, Hz.38. AC to DC Conversion:(A) Single: .(B) Parallel: .(C) Series: .35. Calculate the current in the following three cases:Steps of conversion:(A) .(B) .(C) .(D) .Speed of Electrons39. What is thermal speed of electrons?(A) .(B) .The speed is about: .(C) .DC and AC (Direct Current and Alternate Current)40. What is drift speed of electrons?.36. What is DC:.The speed is about: .41. Why does the electric power company charge youmoney when they provide you AC electricity which nonet electrons enter your home?V or It37. What is AC:.Where is the source of electrons in the AC outlet?.Mr. Lin4

Physics WorksheetElectric PowerElectric Current42. Definition of Electric Power:Section:Name:45. A light bulb is plugged into a 120-volt outlet and has a0.7 A current in it. What is the power rating of the lightbulb?.Formula:.Unit of electric power:.Rewrite the electric power formula in terms of I and V.46. A heater uses 21 A when connected to a 110-V line. Ifelectric power costs 10 cents per kilowatt-hour in thislocation, what is the cost of running the heater for 13hours?.Rewrite the electric power formula in terms of I and R.Rewrite the electric power formula in terms of V and R.Electric Power Formulas:.Electric Energy47. A 120 V outlet in Tony’s house is wired with a circuitbreaker on an 8 A line. a) If Tony tries use his newlybought 1200-Watt hair dryer, will he trip the circuitbreaker? b) What is the resistance of the hair dryer?43. Formula in terms of P and t.Unit of electric energy:.Rewrite the electric power formula in terms of I, V and t.Rewrite the electric power formula in terms of V, R and t.Rewrite the electric power formula in terms of I, R and t.48. Alice likes to keep her 40-Watt front porch light on atnight time from 10 p.m. to 6 a.m., and Alice pays 8.00 per kWh, how much does it cost to run the light for thisamount of time each week?.Electric Energy Formulas:.Kilowatt-Hours (kW·h)44. Calculate 1 kW·h J.Mr. Lin5

Feb 24, 2016 · 2. List the three basic physics quantities in an electric circuit, including their names, symbols, units, and symbols of units. Physical Quantity Symbol Unit Symbol of Unit 3. Draw a simple electric circuit using symbols of wires, a battery, and a light bulb. Then, overlay the three basic physics quantities on the circuit.