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- Two lightbulbs are each connected to a voltage of 120 V. One has a power of 25 W, the other 100 W. (a) Which lightbulb has the higher resistance? (b) Which lightbulb carries more current?5 V 1. For the circuit below, the total current drawn by the circuit is 0.40 A. + a. What is the voltage (in V) across each light bulb? (3) b. Determine the current (in A) in each light (3) bulb. c. What is the equivalent resistance (in 2) of the two branches in parallel? (2) d. What is the total resistance (in 2) of the circuit? (2) R₁ = 7 Ω R₂ = 90 R3 = 1306. Which of the following is not the same as 1 watt? A. 1 joule/second B. 1 ampere/volt 7. We use_ to control electric current in a circuit. B. insulator C. 1 ampere-volt D. 1 ohm-(ampere)² A. resistor C. conductor D. wire 8. Temperature coefficient of resistance is expressed in terms of A. ohms /°C 9. Two aluminium conductors have equal length. The cross-sectional area of one conductor is four B. mhos /°C C. ohms / ohms °C D. mhos /ohm °C times that of the other. If the conductor having smaller cross-sectional area has a resistance of 100 ohms the resistance of the other conductor will be C. 50 ohms 10. Which of the following resistive materials has the lowest temperature coefficient of resistance? C. aluminum A. 400 ohms B. 100 ohms D. 25 ohms A. nichrome B. silver D. copper
- 1. A current of 10 mA passing through the human body causes sustained muscular contraction. For voltage of 220 V, how much electrical resistance does the body have? 2. Three resistors, 3.0 ohms, 5.0 ohms, and 4.0 ohms, are connected in series across a 9.0 V battery. What is the current in the circuit? 3. What is the total resistance of a 6.0- V batter connected to parallel circuit with three resistors, 3.0 ohms, 12 ohms and 4.0 ohms?II. Problem Solving. Show your solutions. Box your final answer. 1. A water heater has a resistance of 502 and takes 15A during operation. If it is in service on the average of 45minutes per day, how many kWh of energy will be consumed for 2 weeks? 2. Two particles with charges of 5 uC and 8µC attract each other with a force of 65mN. Determine the separation distance between the two particles. 3. What separation distance is required if the attractive force between an electron and a proton is 50N? 4. The distance between two identical charges is 20cm and experiencing 50kN of force. Find the value of the charges. 5. A sphere has a negative charge of 640nC. Approximately how many electrons must be removed to make the sphere neutral? 6. How much electrical energy in kWh is delivered to an electric motor during a 48 minutes' operation from a 220v source if it draws 12A of current? If Meralco takes Php12.00 per kWh, how much is the electric bill cost for 1 month? Assume 1 month = 30 days.23. Answer the following questions about total resistance in series and parallel circuits. a. What is the total resistance of a 30 2 resistor and a 10 2 resistor in series? b. What is the total resistance of a 30 resistor and a 102 resistor in parallel? R=(1/R+1/R+..^-1 MacBook Pr
- 1. Suppose that a net number of 12.2 × 1013 electrons pass a particular point along a wire in 2.62 s, moving to the right.(a) What is the electric current in micro-coulomb? (b) What is the direction of the electric current? 2. An electrically neutral balloon is rubbed against a piece of animal fur and acquires a charge of - 0.311 μC. How many electrons were transferred from the fur to the balloon? (Write your answer in scientific notation) 3. Three positive point charges (A, B, and C) lie along the same line and are separated by a distance d, as shown. The symbol q represents a magnitude of electric charge. Let d= 0.165 m. If q = 0.961 μC what is magnitude of the total electric force on charge A? 4. Two identical conducting spheres, A and B, sit atop insulating stands. When they are touched, 1.48 × 1013 electrons flow from sphere B to sphere A. If the total net charge on the spheres is +3.96 μC, what was the initial charge on sphere B? 5. A charge of 0.552 μC passes a particular point…1. Explain how conservation of charge is related to Kirchhoff's junction rule. Explain how conservation of energy is related to Kirchhoff's voltage loop rule. 2. R1 If R2 = R6 = 10 kN and the rest are 1 2, find the 3. R2 R3 effective resistance of R4 the circuit. The circuit 10 V R5 R6 can be estimated as what kind of circuit? R71. Two resistors with resistance values of 4.5 N and 2.3 Q are connected in series or parallel across a 30 V potential difference to a light bulb. a. Calculate the current delivered through the light bulb in the two cases. b. Draw the circuit connection that will achieve the brightest light bulb. 2. Explain the term internal resistance. 3. State how you agree or disagree with the following statement. A good circuit cannot have internal resistance.
- 3. For a circuit that has one battery and two light bulbs connected in series, one bulb has a resistance of 1 Q, and the total resistance of the circuit is 6 Q. What is the resistance of the second light bulb? 4. If a circuit has two 1.5 V batteries in series, what is the voltage across the two batteries? 5. If a circuit has two 1.5 V batteries in series and one 3 Q light bulb, what is the current in the circuit? Use the Ohm's law equation: I = R1. Why is an electromotive force not a “force”? Justify your answer. 2. Are electromotive force and voltage the same? Justify your answer. 3. A battery contains an emf of 20.0 V. Determine the current flowing the circuit once it is connected to a 30.50 Ω load if the internal resistance of the emf is equal to 0.234 Ω. 4. A battery has an emf of 12V. When a load resistance of 4 Ω is connected to the battery terminals; a current of 2 amperes flows through it. Calculate the internal resistance of this battery. NOTE: Derive the formula of emf to get the internal resistance.1. Question 1: a. Draw a simple circuit diagram with a battery and a light bulb and how you can simultaneously use a voltmeter to measure the voltage drop across the resistor and use an ammeter to measure the current through the resistor. Label both circuit elements along with the current using the notation from Figures 1 and 2. b. If the battery voltage is 2V and the light bulb resistance is 100, what is the current in this circuit?