A coffee cup immersion heater utilizes a heating coil with a resistance of 8.5 Ω. b. R1 = R2 = R3 = 11.1 ΩΔV1 = ΔV2 = ΔV3 = 4.0 V. A 4.5-volt series circuit consists of two resistors. Choose your answers to the questions and click 'Next' to see the next set of questions. 0.800 Ω Extra Question Find out the following in the electric circuit given in Figure 12.9 (a) Effective resistance of two 8 Ω resistors in the combination (b) Current flowing through 4 Ω resistor (c) Potential difference across 4 Ω resistance (d) Power dissipated in 4 Ω … 100-W lamp bulb: 120 Ω (rounded from 121 Ω). The resistance values for each appliance is listed in parenthesis. d. 4.65 Ω. Physics 2 (PH 202L) Uploaded by. All rights reserved. Determine the current in the circuit. Sciences, Culinary Arts and Personal d. Determine the overall current on the circuit with the mixer, crockpot, juicer, blender and electric fondue operating. a. c. aluminum (resistivity = 2.65x10-8 Ω•m) back The equivalent resistor R 234 = 2 Ohm. i. t Where, E is the heat, V is the potential difference of Audio Guided Solution d. … 5.0 Ω and 9.2 Ω a. This results in an average current of approximately 3 mA into a human body. Top voltmeter reading (across R1): 16.1 V Each 100-bulb string of lights is rated at 40 Watts. b. The unit runs for 8.0 hours during the course of a day. Determine the current for such a computer. When you have completed the practice exam, a green submit button will Resistor A has three times the resistance as resistor B. Using 100,000 Ω as the overall resistance, determine the output voltage required of a defibrillating device. The voltage source (ΔVtot) is a 110.-V source and the resistor values are 15.4 Ω (R1), 21.9 Ω (R2) and 11.7 Ω (R3). Bottom ammeter reading (outside branches): 1.695 A c. 5.0 A. … 8.0 Ω and 8.0 Ω The voltage source (ΔVtot) is a 48-V source and the resistor values are 6.4 Ω (R1) and 3.9 Ω (R2). An ammeter can be used to determine the current at any given location on a circuit. Determine the resistance of each string of lights. D. Current I 2. b. silver (resistivity = 1.59x10-8 Ω•m) In a given unit of time we can find the emitted heat from the conductor as follows; E=V. 2018/2019 Determine the resistance values of the resistors and the voltage drops across the resistors. i. f. Req = 4.9 Ω. Electric space heater (950 W) - operated for 4 hours Caleb Smith. on your results. b. Determine the amount of energy used during one evening in units of kiloWatt•hours. She decides that her 4.0-Watt clock radio alarm does not need to be on for 24 hours every day since she only needs it for waking up after her average 8-hour sleep. Ammeter readings: 1.57 A (for each) g. 57.4 A Click it to see your results. Turning the switch of the lamp toggles the light from OFF to low (50 W) to medium (100 W) to high (150 W) brightness. Generators are used to generate voltage in what type of power plant? b. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. LED night light (I=0.0042 A) According to Cullen's friends, they have every imaginable kitchen gadget that exists. Good luck! Determine the overall resistance of a 100-meter length of 14 AWA (0.163 cm diameter) wire made of the following materials. Power of 2.5 Ω resistor: 32.4 W multiplying the current times the current times the resistance, multiplying the current times the difference between the voltage going into and going out of the device, multiplying the voltage times the voltage times the current, multiplying the resistance times the resistance times the current, multiplying the resistance times the difference between the voltage going into and going out of the device, convert light energy into electrical energy to generate voltage, convert wind energy into electrical energy to generate voltage, convert heat energy into electrical energy to generate voltage, convert one type of energy into electrical energy to generate voltage, is caused by free electrons in the material, is a measure of how much an object impedes an electric current, voltage passes through a device over time, current passes through a device over time, electrons moving through the conductor will have fewer collisions, electrons moving through the conductor will lose less energy, the atoms in the conductor will stop moving, the flow of a conductor through charged particles, the random movement of electrons from atom to atom, the flow of charged particles through a conducting medium, the atoms of the material vibrating in response to heat, the binding of the free electrons to the atoms, the collisions of free atoms with their outer electrons, collisions of free electrons with the outer electrons of the atoms, is easier to transform to other voltages than alternating current, causes the lights to flicker in your house, is best for long-distance power transmission, is the flow of electrons in one direction, is slower than the movement of the electrons in the conductor, happens slower than a leisurely walking pace, changes direction several times per second, is not good for long-distance power transmission, is not used in houses because it is dangerous, low in materials with very few free electrons, high in materials with lots of free electrons.