Suppose the electric company charges 2.6 cents per kW-h. How much does it cost to use a 125 watt lamp 4 hours a day for 30 days? Select one: a. 0.47 $ b. 1.87 $ c. None of the above d. 0.31 $ e. 0.39 $
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- An electric car is designed to run off a bank of 15-V batteries with total energy storage of 2.1 × 107 J. If the electric motor draws 4 200 W in moving the car at a steady speed of 14 m/s, how far will the car go before it is “out of juice?” a. 35 km b. 70 km c. 140 km d. 110 km e. 18 km10. Determine the maximum number of 50 w/100 v light bulbs that can be connected together in parallel so as not to burn out a 15 A fuse when the bulbs are powered by a 75 v source (assume that the resistance of the fuse is negligible). A. 40 B. 30 C. 20 D. 10 TRASuppose you leave a 50 W bulb on for a month. Approximately how much will you pay for using that much energy? (Assume that electricity is charged at a rate of $0.10/(kW hour).) A) 3 cents B) 30 cents C) 3 dollars D) 30 dollars E) 300 dollars
- Some possibly useful numbers = 8.99 x 10° N m2/C2 €0 = 8.85 x 10-12C²/Nm2 4TEO %3D = 10-7Tm/A e = 1.6 x 1019 C me = 9.11 x 10-31kg mp = 1.67 x 10-27kg %3D leV = 1.6 x 10-19 J33. If the battery has a voltage of 12V, what is the current through the battery? E. 5 A 12 C. 2 A D. 6 A A. 1A B. 4 A4. Given a DC battery of 12.0 volts connected to a single resistor of 3.00 Ohms. What current goes through the resistor? a. 12.0 A b. 36.0 A c. 3.00 A d. 4.00 A e. 16.7 A
- How much power is dissipated in the 5Ω resistance? a) 7.62 w b) 11.02 w c) 2.44 w d) 9.14 w. e) none of these.1. With a 1200 W toaster, how much does it cost to make a slice of toast (cooking time = 1 minute)? Electricity costs 4.5 cents per kW.h. 0.135 centsThe unit of Volts is alternatively described by all of the following units EXCEPT A. (kg/C)(m/s)2 B. J·m·C C. J/C D. (N/C) m