Question

1 What is the total energy stored in a car battery that is rated 12V, 100A.h? Give answer both in Joules and kWh. 2 A toaster draws 10A when connected to 120V. a. How much charge goes through the toaster in the span of one minute? b. How many electrons pass through the toaster in one minute? c. How many moles of electrons is this? d. What is the resistance of the heating element of the toaster? e. How much power does the toaster draw? f. How much energy does the toaster use in one minute? Give answer in Joules and kWh. g. The cost of a kWh is about 15 cents. What does it cost to use a toaster for 1 minute? h. What is the peak current and peak voltage drawn by the toaster?

If I could receive help on both that'd be great.

Questions on Charge

Answer 1

Energy stead E = Vq = VIt = 12 times 100 times 3600 = 432 times 10^4 U = 4.32 times 10^6 J U = Vq = VIt = 12 times 100 Hr = 1200 W - Hr times 1000/1000 = 1.2 kwH I = 10 A, V = 120 V a I = q/t => q = It = 10 times 60 q = 600 c b q = ne => n = q/e = 600/1.6 times 10^-19 = 375 times 10^19 = 3.75 times 10^21 electrons d R = V/I = 120/10 = 12 ohm e P = VI = (120) 10 = 1200 W f U = Vq = 120 times 600 = 72 times 10^3 = 7.2 times 10^4 J U = Vq = VIt = 120 times 10 times 60 s = 120 times 10 times 60/3600 hr times 1000/1000 = 1200/60 times 10^3/10^3 W - hr = 0.02 kwh g kwh rightarrow 15 cents 0.02 kwh