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PRETEST Directions: Read the questions carefully Choose the best answer from the choices given. 1. What circuit element is represented in the shown gure? W a battery a resistor a capacitor an inductor iii-PET?\" 2. How would a diagram of two resistors connected in series appear? am h.\\AMw/W +I _ +|l_ 3. Three resistors, 10, 20. and 30' Q, are connected in parallel. What is the equivalent resistance? :1. . The equivalent resistance is 5.45 D The equivalent resistance is 60 9 The equivalent resistance is 6 K 103 Q The equivalent resistance is 6 x 104 D so an 4. If a 5-V drop occurs across R1, and R1 is connected in parallel to R2, what is the voltage drop across R2? 3.. 1linkage drop across is UV; b. Voltage drop across is 2.5V. c. 1Voltage drop across is 5V. d. Voltage drop across is 10V. 5. From the equation (resistancein series circuit] Rt - R1 +1112 +R3... and I-'ivrfR+ row will you describe the current when resistance in series circuit increases? a. the current also increases hi the current decreases c the current uctuates d. the current stays the same ACTIVITIES Activity #1: Circuit Diagram Directions: Answer the following questions. Write your answer in the space provided. a. What is a circuit diagram? b. Draw the labeled diagram of an electric circuit comprising of a cell, a resistor. an smmeter. s. voltmeter, and a. switch {or plug key]. Activity #2: Finding Relistanoe, Current, and Voltage in series and parallel circuit Directions: Calculate the equivalent resistance, current. and voltage in a given artwork of resistors connected in: A. Series circuit: 1. Two 60-0 resistors are connected in series with D. 15 P. flowing through them? Find a. Total Resistance [Rt] 1:. 1r'oltsge drop [Vt] across resistors c. Current through the circuit 2. In this circuit, the voltage drop across the upper resistor is 4.5 V. What is the battery voltage? What is the current through the circuit? What is the resistance in the circuit? 30 Activity #2: Finding Resistance, Current, and Foliage in series and parallel circuit Directions: Calculate the equivalent resistance, ctnrent. and voltage in a given trim of resistors connected in: A. Series circuit: 1. Two BD resistors are connected in series with D. l 5 A owing through them? Find s. Total Resistance [Rt] h. Voltage drop [Vt] across resistors c. Current through the circuit 2. In this circuit, the voltage drop across the upper resistor is 4.5 V. What is the hatter voltage? What is the current through the circuit? What is the resistance in the circuit? 30 Q B. Parallel Circuit: 1. 1What is the equivalent resistance of this circuit? 150 0 250 D. 500 Activity #3 Comparing the resistance, current, and voltage in series and parallel Directions: Complete the table below. Write the formula on the space provided, Series Formula Parallel Formula Current It = 11=12=13... Voltage Vt = V1=V2=V3... Resistance R1 + R2 +R3... VE WRAP-UP Directions. Underline the correct answer from the statement below. . As load (resistance) is being increased in series connection, the current (decreases, increases). The current (decreases, increases) as the load (resistance) in the parallel connection is increased. VALUING How are bulbs and or LED lights in your house connected? Why is this so? POSTTEST Directions: Read the questions carefully. Choose the best answer from the choices given. 1. The voltage drop across parallel resistors is a. the same for all resistors b. greater for the larger resistors c. less for the larger resistors d. greater for the smaller resistorsgiven. 1. The voltage drop across parallel resistors is . the same for all resistors b. greater for the larger resistors c. less for the larger resistors d. greater for the smaller resistors 2. What happens to the current in a parallel circuit when the load or resistance is increased? a. current increases b. current decreases c. current stays the same d. current fluctuates 3. Given the circuit diagram below, what equation should be used to find the total resistance? R& = V & Requiv a. Requiv=1/R1+1/R2+1/R3. b. Rt= R1 + R2+ R3... c. Rt = R1 - R2 - R3 d. Rt = R1 x R2 x R3 4. How is an ammeter connected in a circuit to measure current flowing through it? a. An ammeter is connected in series in a circuit to measure current flowing through it. b. An ammeter is connected in parallel in a circuit to measure current flowing through it. c. An ammeter can be connected either in series or in parallel in a circuit to measure current through it. d. An ammeter can be connected anywhere in the circuit. 5. How many 10-2 resistors must be connected in series to make an equivalent resistance of 80 0? a. b. 8 . 20 . 40