Electricity & Magnetism Chapter 19 and 20 Review for Test April 19, 2005

Question 1 What are the units for resistance? A. volts B. ohms C. amps D. watts E. meters

Question 2 A circuit has 120 volts and a current of 10 amps. What is the resistance? A ohms B ohms C volts D. 12 ohms E. 12 amps

Question 3 In a schematic diagram, what does this symbol represent? A. Power Source B. Wire C. Light Bulb D. Ammeter E. Voltmeter

Question 4 In a schematic diagram, this represents a power source. Which side is the positive terminal? A. Left B. Bottom C. Right D. Top E. None

Question 5 Describe a circuit that has a high current and a low voltage in terms of electrons and energy. A. Few electrons, high energy B. Few electrons, low energy C. Many electrons, high energy D. 18 electrons, high energy E. Many electrons, low energy

Question 6 What is the voltage in a circuit that has 10 amps of current and 5 ohms of resistance? A. 10 volts B. 50 amps C. 2 volts D. 50 volts E. 15 volts

Question 7 The force of attraction between two charges gets smaller as the two charges move farther apart. What law is this? A. Coulomb’s Law B. Newton’s First Law C. Kinetic Theory of Matter D. Ohm’s Law E. Cole’s Law

Question 8 What type of circuit has only one path for electrons to flow? A. Alternating Current B. Open Circuit C. Series Circuit D. Parallel Circuit E. Combination Circuit

Question 9 Which of the following materials is a good conductor? A. Wood B. Paper C. Glass D. Copper E. Plastic

Question 10 A resistor slows down the flow of electrons. What does this create? A. Bunnies B. Homework C. Music D. Air E. Heat

Question 11 Which two light bulbs are connected in series? A. P and E B. H and G C. G and P D. C and L E. P and H

Question 12 How many lights go out when the switch at J is open? A. 0 (none) B. 1 C. 2 D. 3 E. 5 (all)

Question 13 Which way is electricity moving? A. From B to D B. From I to F C. From N to K D. From D to B E. From K to I

Question 14 If Light G goes out, what happens? A. E & H stay on, C & P go out B. All other lights stay on C. H, C, and P stay on, E goes out D. All other lights go out E. E & H go out, C & P stay on

Question 15 Where can you put a switch that would control the whole circuit? A. Between G and H B. Between P and K C. Between B and C D. Between D and E E. Switch J already does this

Question 16 What is “L”? A. Ammeter B. Resistor C. Light Bulb D. Power Source E. Voltmeter

Question 17 Which light should be the brightest? A. G B. B C. H D. P E. E

Question 18 If Light P was replaced with a voltmeter, would it work properly? Why? A. Yes, because it’s in parallel B. Yes, because it’s in series C. No, because it’s in parallel D. No, because it’s in series E. It depends on the battery

Question 19 If Light C was replaced with an ammeter, would it work properly? Why? A. Yes, because it’s in parallel B. Yes, because it’s in series C. No, because it’s in parallel D. No, because it’s in series E. It depends on the battery

Question 20 If each bulb has 10 ohms of resistance, what is the total resistance from D  F  I  K ? A. 10 ohms B. 20 ohms C. 30 ohms D. 40 ohms E. 50 ohms

Question 21 How much current is passing through a radio carrying 120 volts with a resistance of 240 ohms? A. 0.5 amps B. 1 amp C. 2 amps D. 10 amps E amps

Question 22 A circuit is carrying 9 amps of current and has 10 deciohms of resistance. What is the voltage in the circuit? A. 90 amps B. 9 amps C. 0.9 volts D. 9 volts E. 90 volts

Question 23 Which of the following is a property of matter? A. Magnetism B. Electrical Power C. Amp D. Compass E. Parallel Circuit

Question 24 Which device converts electrical energy into mechanical energy? A. Static Electricity B. Electric Motor C. Superconductor D. Generator E. Maglev

Question 25 Which device changes the amount of voltage in a circuit? A. Compass B. Electric Motor C. Superconductor D. Generator E. Transformer

Question 26 Which device aligns with the Earth’s magnetic field? A. Compass B. Electric Motor C. Superconductor D. Generator E. Transformer

Question 27 An atom becomes positively charged when it ____________ A. Gains Protons B. Loses Protons C. Gains Electrons D. Loses Electrons E. Loses Neutrons

Question 28 Which of the following wires would have the least resistance? A. Short and Thin B. Long and Thin C. Short and Thick D. Long and Thick E. Red and Blue

Question 29 How do you create static electricity? A. Rub two conductors together B. Rub two insulators together C. Attach a battery to a circuit D. Plug it in E. Rub an insulator on a conductor

Question 30 What is Ohm’s Law? A. When the bell rings and you go “ohm”. B. F = m x a C. v = λ x f D. D = m / V E. V = I x R