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- 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.Part A.EMF or PD? Directions: Identify the statement below whether an emf or PD. Write E if the statement shows electromotive force, and P if the statement shows potential difference. 1. The energy supplied to the unit charge by the cell. 2. The energy dissipated as the unit charge passes through the components. 3. Present even when no current is drawn through the battery. 4. Across the conductor is zero in the absence of current. 5. Its unit is volt, and symbol is E. 6. Its unit is volt, and symbol is V. 7. It is always greater than potential difference. 8. It is always less than emf. 9. It transmits current both inside and outside of the cell. 10. Transfer current between two points in the cell. 11. Its formula is E = I(Rtr); where Rtr stands for total internal and external resistance. 12. Its formula is V = E – Ir. 13. It does not depend on circuit resistance. 14. It directly depends on the resistance between two points of measurement. 15. It causes electric, magnetic, and…a. What should be the value of X such that the total resistance of the circuit is 22 ohms? b. What is the voltage across R4? c. How much current is flowing through R3?
- B. Directions: Read, understand, and perform the tasks by applying what you learned. 1. Make a Venn Diagram comparing emf of a source and potential difference across the circuit. 2. The battery supplies a maximum voltage of 12 V. When it is connected to an external circuit, the voltage measured by the voltmeter across the circuit is only 10 V. Is this possible? Explain your answer. 3. Why do the problems occur when an ammeter is connected in parallel with the lamp?1. 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.A. Notice that the switches (indicated by positions A and B) are set to position A, and the capacitors and two identical lightbulbs (labeled LB1 and LB2) are not connected. Calculate the equivalent resistance of the circuit and the total current. B. How much current flows through the 5 Ω resistor? How about the 3 Ω resistor? C. How much power is dissipated by each of the resistors? D. Now suppose the switches are both changed to position B, such that the capacitors and the identical light bulbs are connected. Which light bulb will turn off first? Explain.Hint: consider that the resistances of LB1 and LB2 are identical. E. How much charge will each of the capacitors have in the end?
- a. How much current is drawn from the source?b. What is the terminal voltage of the battery?c. What is the total resistance?d. What is the voltage drop across each device?e. What is the current in the resistor [6-ohm]? Note: Draw another schematic showing combinations of resistance [if there is any]1.How could the elements be arranged to create a circuit with the minimum electrical resistance (to make the battery use as much energy as possible?) 2.How could the elements be arranged to create a circuit with the maximum electrical resistance (to keep the battery from using any energy?) 3.a.Which object do you think should be selected to create circuits with more resistance? b.What do you think is the relationship between the length of an object and its resistance?6. a. Draw a circuit diagram of a resistor hooked up to a battery so current flows through the resistor. b. For your circuit, indicate where the highest potential is (label with an “H" on the circuit) and where the lowest potential is (label with an “L" on the circuit.) c. For your circuit, indicate the direction of the current (conventional current I) with an arrow drawn on the circuit. d. Does the current flow from high to low potential, or from low to high potential? e. What is the direction of the actual electron flow in the circuit? (Describe, don't mark on the circuit.) Where is the current highest in the circuit? (Describe don't mark on the circuit )
- 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 = 1304. The circuit contains four resistors and an ideal battery. a. What is the equivalent resistance of this circuit? b. Using series and parallel rules, what is the current through the 24.0 Ω resistor? c. Check your answer in (b) by solving for the current using Kirchhoff rules. d. If the battery was not ideal, would you expect your answer in (b) to increase, decrease, or remain the same? Explain your answer.Answer the following questions about the circuit below. a. Find the total resistance of the circuit. b. Find the total current of the circuit. c. What is the current through R1? d. What is the current through R2? What is the current through R3? e. What power is dissipated by R1? f. What power is dissipated by R2?