A 40.0-W lightbulb is connected to a 110.0-V source. (a) What is the current through the bulb? (b) What is the internal resistance of the bulb? Ω
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- 0.3 Ω AO6.0 N ) 6.0 Ω 2.5 V If the battery in the above figure were ideal, lightbulb A would not dim when the switch is closed. However, real batteries have a small internal resistance, which we can model as the 0.3 Q resistor shown inside the battery. In this case, the brightness of bulb A changes when the switch is closed. (a) How much power does bulb A dissipate when the switch is open? (b) How much power does bulb A dissipate when the switch is closed?A resistor with an unknown resistance is connected in parallel to a 13 Ω resistor. Whenboth resistors are connected in parallel to anemf source of 20 V, the current through the unknown resistor is measured with an ammeter to be 4 A.What is the resistance of the unknown resistor?Answer in units of Ω.(a) What is the resistance of a 135 Q, a 2.50 k2, and a 4.25 k2 resistor connected in series? Ω (b) What is the resistance if they are connected in parallel? Ω
- ww 24 0 Questions 3 & 4 refer to the circuit shown in the figure. The battery emf is 12 V. ww ww ww 12 0 3. What is the power dissipated by the 8 N resistor? [Hint: don't make this more work that you have to.] А. 4.5 W В. 6.0 W C. 8.0 W D. 18 W 3. 4. What is the current through the battery? [Hint: now you really do have to do all that work!] А. 0.50 A В. 1.5 А С. 3.0 А D. 6.0 A 4.A 40.0-W lightbulb is connected to a 110.0-V source. (a) What is the current through the bulb? A(b) What is the internal resistance of the bulb? ΩA resistor with an unknown resistance is connected in parallel to an 11 Ω resistor. Whenboth resistors are connected in parallel to anemf source of 17 V, the current through theunknown resistor is measured with an ammeter to be 4 A.What is the resistance of the unknown resistor? Answer in units of Ω.
- (b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 3.90 V. How much energy, in units of kilowatt-hours, is stored in a fully charged battery? kWh (c) If electricity costs $0.12 (or 12.0 cents) per kilowatt-hour, what is the value of the total amount of energy stored in this battery? Express your answer in cents (or 0.01 of a dollar). ¢ (d) When the phone is idle (that is, turned on but not making calls or texts, using GPS, or running any power-hungry apps), it will operate continuously for 29.2 hours from a fully charged battery, until the battery runs out. How much average current does the phone draw while idle? Express your answer in milliamperes. mAA 10.0 μF capacitor is charged to 50.0 V and is then connected across a 460 Ω resistor only. What is the voltage across the resistor after 7.60 ms?If electrical energy costs $0.12 per kilowatt-hour, how much do the following events cost? (a) To burn a 120-W lightbulb for 24 h. $ (b) To operate an electric oven for 6.6 h if it carries a current of 20.0 A at 220 V. $