Basic Electricity II - Study Guide Prep Exams, Exams of Basic Electronics

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Basic Electricity II - Study Guide Prep Exams

1-1 Two laws of electrical charges are that charges repel and charges attract. - ANSWERike: unlike 1-2 As long as a difference in potential exists in a circuit having a complete path for current flow, current will flow from. to. -~ CORRECT ANSWER- negative; positive 1-3 One ampere is equivalent to one. (6.28 billion, billion electrons) flowing past a given point in one . 1-4 To measure current in a conductor, an. must be placed in series (in line) with the conductor - ammeter 1-5 Early experiments revealed that certain substances lose or gain. when subjected to friction; thereby, leaving the material with either a positive or negative___ 1-6 When two unlike bodies are brought together or connected by a wire, they attempt to. ANSWER-neutralize 2-1 Potential difference, potential energy, electrical charge, emf (force), and electrical pressure all pertain to the same electrical term - CORRECT ANSWER-voltage 2-2 The unit of measurement for voltage is the - CORR! ANSWER volt 2-3 The six commonly used methods to produce emf are: - CORRECT ANSWER-1. friction 4. heat 2. pressure 3. chemical action 3. light 6. magnetism 2-4 The mosl commonly and widely uscd methods of producing vollage is by ANSWER chemical action; electromagnetic induction 3-1 Resistance is the property of a material which__ the flow of electrons - CORRECT ANSWER opposes 3-2 A material which offers Little resistance to current flow is called a/an__ - conduc Lor 3-3 A material which offers a grcat amount of re ance Lo current flow is called a/an, - CORRECT ANSWER-insulator 3-4 A material which has neither a groal. amount of free electrons nor a Low fro electrons. but rather falls in between these two categories, is called a - C ANSWER-semiconductor current flow of one ampere results. This relationship is called - CORRECT ANSWER-one; Ohm's Law 4-4 In relating resistance to conductors and insulators, an insulator will have. resistance, and a conductor will have. resistance - CORRECT ANSWER- high: low 4-5 Use Ohm’s Law to compute the resistance value of a circuit that has 30 volts applied and 3 amperes of current flow. Total resistance willbe___ - CORRECT ANSWER-10 ohms 46 A circuit having 1 ampere of current flow and total resistance of 10 ohms will have, A-7 What is the voltage of this circuit? E=__ volls T=10 amps R=11 ohms ORRECT ANSWER-E =IR=10 x 11=110 volis 4-8 What is the curren. in this circuit? E =30 volts I= _amps R= 13 ohms - € R15 4-§ What is the resistance of this circuit? E=12 volts T=12 amps R= ohms - CORRECT ANSWER-R =E = 12=1 ohm 112 4-10 What is the resistance of this circuit? E=110 volts l=5 amps R= _ohms - CORRECT ANSWER-R = E = 110 = 22 ohms 15 4-11 What is the voltage in this circuit? E= volts T=10 amps R= 24 ohms - CORRECT ANSWERE =IR=10 x 24 = 240 volts 4-12 What is the voltage in this circuit? E=__ volls I= 1.2 amps R=10 ohms - CORRE ‘ ANSWER-E =IR=1.2 x 10 = 12 volts 4-13 What is the voltage in this circuit? R= ohms - CORRECT ANSWER-R = E = 240 = 12 ohms 120 4-18 What is the current in this circuit? E = 240 volts l= __amps R480 4-19 What is the resistance of this circuit? E= 240 volis T=10 amps R= _ohms - CORRECT ANSWER-R = E = 240 = 24 ohms 110 4-20 What is the vollage in this circuit? E= volts T=4 amps R=1000 ohms - CORRECT ANSWER-E = IR = 4 x 1000 = 4000 volts 4-21 What is the voltage in this circuit? E=__ volts T=11 amps R=10 ohms - CORRECT ANSWERE =IR=11x10=110 volts 5-1 What is the voltage of this circuit? E= T=10 amps R=11 ohms P =1100 watts - CORRECT ANSWER-E =IR=10 x 11=110 volts 3-2 What is the current in this circuit? E=30 volis I=__ R= 13 ohms P =60 watts - CORRECT ANSWERI=E =30=2 amps R15 3-3 What is the resistance of this circuit? E=12 volis T=12 amps R= P= 144 watts - CORRECT ANSWER-R=E =12=1 ohm 5-4 What is the power dissipated in this circuit? E=110 volts l=5 amps P= R=1000 ohms- CORRECT ANSWER-P =E al cuadrado = 100 x 100 = 10000 = 10 watts R 1000 1000 or I=E=100=.1andP=EI=100 x.1=10 watts R 1000 5- What is the power of this circuit? E= T=10 amps P= R=20 ohms - CORRECT ANSWER-P = 12 R=(10 x 10) x 20=100 x 20 = 2000 watts E=IR=10 x20 = 200 and P = El = 200 x 10 = 2000 watts 3-10 What is the current in this circuit? E= 1000 volts I=__ R= 10000 ohms P = 100 watts- CORRECT ANSWER-I = E = 1000 =.1 amp R 10000 3-11 What is the resistance of this circuit? E = 240 volts T= 20 amps P = 4800 watts R=_ CORRECT ANSWER-R=E = 240 = 12 ohms 120 3-12 What is the current of this circuit? E = 240 volts P = 480 watts [=P =480=2 amps 3-13 What is the resistance of this cireuit? E= T=10 amps P = 240 watts R=_ ie -R=P = 240 = 240 = 2.4 ohms Tal cuadrado (10 x 10) 100 5-14 What is lhe power of this cireuit? E= T=4 amps R= 1000 ohms P= - CORRECT ANSWER-P =Jal cuadrado R=(4 x 4} x 1000 = 16 x 1000 = 16000 watts 7-2 The magnetic strength that a material can reach is limited by the. point of that material - CORRECT ANSWER-saturation 7-3 The most common method of aligning molecules of a material is through the use of. ER electricity 8-1 A conduetor bent to form a loop will present a. on one face and a. on the other face of the loop. - CORR. 8-2 To delermine the north magnetic pole of a coil, the left-hand rule for coils can be used. When using this rule, the thumb points in the direction of the__. - CORRECT ANSWERnorth pole 8-3 When an easily magnetized material is placed within a coil, the material__ _ of the coil - CORRECT ANSWE- increases; the magnetic strength field around it. Direction of 8-4 A current-carrying conductor produces a magneti movement of the magnetic lines of force around the conductor is determined by the dircelion of, - CORR) ‘ER-current flaw 8-3 When using the left hand rule for conductors, the thumb indicates the dircelion of - CORRECT ANSWER-current flow 8-6 In an illustration, if a conductor has (4) in it: ter, the current through the conductor is traveling toward__ - CORRECT ANSWERthe page, away from the reader 8-7 In an illustration, if a conductor has a (.) in its center, the current is traveling TANS toward, -{ ‘the reader, away from the page 9-1 To have electromagnetic induction, there must be a magnetic field, a conductor within the magnetic field, and. between the two. - CORRECT 9-2 Relative motion between a conductor and its magnetic field is provided whenever the magnetic field is or. - CORRECT ANSWER- expanding; collapsing 9-3 To have a continuously induced voltage in a coil, the current through that coil must continually -¢ ‘R-change in; magnitude 9-4 Tn electromagnetic induction, induced voltage will always the change thal crealed it- CORRECT ANSWEF-appose 9-5 An inductor will appear as a load or as an opposition to a current that conlimiously changes in direction. However, an inductor will have 10-7 Which has the greater ability for magnetic strength, iron or air?- CORRECT ANSWER-tron 10-8 Explain what is meant by magnetic saturation of iron or steel?- CORRECT ANSWER-When a further increase in the magnetizing force will add only a few lines of magnetic flux to the field about a magnetic material, the material is said to be magnetized to saturation. Review 1 What is the formula for solving the voltage in a DC circuit?- CORRECT ANSWERE =IR Review 2 What is the formula for solving the resistance in a DC circuit? - CORRECT ANSWERR=E Review 3 What is the formula for solving the current in a DC circuit? - CORRECT R Review 4 The unit for voltage is the_ - CORRECT ANSWER-olt Review 5 The unit for current is the__ - CORRECT ANSWER-ampere, or amp Review 6 The unit for resistance is the - CORRECT ANSWER-ohm Review 7 Use Ohm's Law to compute the resistance value of a circuit that has 40 volts applied and 4 amperes of current flow. Total resistance will be. ANSWER-10 ohms Review 8 A circuit having 2 amperes of current flow and total resistance of 10 ohms will have. Review 9 What is the voltage in this circuit? E= volts T=11 amps R=11 ohms - CORRECT ANSWER-121 volts Review 10 What is the current in this circuit? E=45 volts I= __amps R= 15 ohms - CORRECT ANSWER amps Review 11 What is the resistance of this circuit? E=120 volts T=12 amps R= ohms - CORRECT ANSWER-10 ohms Review 12 What is the voltage in this circuit? E=__ volts T=13 amps - CORRECT. l=5 amps R= ohms - CORRECT ANSWER-22.2 ohms Review 18 What is the voltage in this circuit? E=__ volts T=12 amps R= 12 ohms - CORRECT ANSWER-144 volls Review 19 What is lhe voltage in this cirewt? E=__ volts T= 1.2 amps R=50 ohms - CORRECT ANSWER-60 volts Review 20 What is the voltage in this circuit? E=__ volts T=10 amps R=60 ohms - CORRECT ANSWER-600 volts Review 21 What is the current in this cireuit? E =1,000 volis I= __amps R= 2,000 ohms - CORRECT ANSWER0.5 amps A leading stone or lodestone is a___ stone - CORRECT ANSWER magnetic or magnetite magnets are weal, natural; artificial These lines of force are called flux lines. All flux lines are complete and no two lines of force ever cross. The largest concentration of flux lines is found at each - pole Earth's south geographic pole is also the Earth’s magnetic - CORRECT ANSWER-north pole Notice that, as in the case of the bar magnet, the flux lines exit at the magnictic _ pole and reenter al the magnetic. pole - CORRECT when a magnet is at its maximum magnetic strength, it is said to be magnetically saluralod Further experiments have shown thal. a current-carrying conductor has a magnetic field around it. This magnetic field acts in a manner similar to the field of force around a magnet. Therefore, electricity produces - CORRECT the dot in the center of the