TALLER DE ELECTRICIDAD 1

Transcription

1 TALLER DE ELECTRICIDAD 1 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material? 1) A) resistance B) resistivity C) 1/(resistivity) D) power E) 1/(resistance) 2) The figure shows conventional current passing through a resistor. The arrow shows the direction in which this conventional current is flowing. Which of the following statements are correct? (There could be more than one correct choice.) 2) A) The electric potential is lower at point b than at point a. B) The charges are moving slower at point b than at point a. C) The electric potential is higher at point b than at point a. D) The current at point b is the same as the current at point a. E) The electric potential at point b is the same as it is at point a. 3) For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material? 3) A) power B) resistivity C) 1/(resistivity) D) 1/(current) E) current

2 4) If a quantity you calculated has units of kg m 2 what is that quantity? 4) s C2 A) potential B) resistance C) resistivity D) current E) capacitance 5) Which one of the following quantities is equivalent to 1? 5) A) 1 V A B) 1 W/A C) 1 A s D) 1 V/A E) 1 J/s 6) Which one of the following quantities is equivalent to 1 W? 6) A) 1 V/ B) 1 V/A C) 1 V A D) 1 A s E) 1 m 7) A kilowatt-hour is equivalent to 7) A) 3,600,000 J. B) 3,600,000 J/s. C) 3600 J. D) 1000 W. E) 3600 J/s 8) What is the voltage drop across a 5.0- resistor if the current through it is 5.0 A? 8) A) 25 V B) 1.0 V C) 4.0 V D) 100 V 9) What potential difference is required to cause 4.00 A to flow through a resistance of 330? 9) A) 1320 V B) 12.1 V C) 334 V D) 82.5 V 10) A light bulb operating at 110 V draws 1.40 A of current. What is its resistance? 10) A) 109 B) 12.7 C) 78.6 D) ) A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is m. A) V B) V C) 0.67 V D) 0.34 V 11) 12) The resistivity of the material of a wire is m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance? A) 112 B) C) D) 11.2 E) )

3 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 13) Draw a circuit with a battery connected to four resistors, R1, R2, R3, and R4, as follows. Resistors R1 and R2 are connected in parallel with each other, resistors R3 and R4 are connected in parallel with each other, and both parallel sets of resistors are connected in series with each other across the battery. 13) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 14) When unequal resistors are connected in parallel in a circuit, 14) A) the potential drop is always the same across each resistor. B) the power generated in each resistor is the same. C) the largest resistance has the largest current through it. D) the same current always runs through each resistor.

4 15) Identical light bulbs can be attached to identical ideal batteries in three different ways (A, B, or C), as shown in the figure. The ranking (from lowest to highest) of the total power produced by the battery is 15) A) A, B, C B) C, B, A C) B, A, C D) C, A, B E) A, C, B 16) Identical ideal batteries are connected in different arrangements to the same light bulb, as shown in the figure. For which arrangement will the bulb shine the brightest? 16) A) A B) B C) C 17) A combination of a 2.0- resistor in series with 4.0- resistor is connected in parallel with a 3.0- resistor. What is the equivalent resistance of this system? A) 3.0 B) 9.0 C) 4.0 D) ) Five 2.0- resistors are connected as shown in the figure. What is the equivalent resistance of this combination between points a and b? 17) 18) A) 2.0 B) 1.0 C) 6.0 D) 10.0 E) 0.40

5 19) What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures. 19) A) 257 B) 450 C) 950 D) 392 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 20) For the circuit shown in the figure, the battery is ideal and all quantities are accurate to two significant figures. Find the current through the 4.0- resistor. 20)