Calculate yearly cost of electricity in billions of dollars

Reference no: EM13997910

1. The average television is said to be on 6 hours per day. Calculate the yearly cost of electricity, in billions of dollars, required to operate 100 million TVs, assuming their power consumption averages 175 W and the cost of electricity averages 10.5 cents/kW·h.

2. In order to measure the properties of a battery, several resistors are connected to the battery in series and the terminal voltage is measured. In the first case, the resistor has resistance R₁ = 2 Ω and the terminal voltage is ΔV₁ = 3.4 V. In the second case, the resistor has resistance R₂ = 79 Ω and the terminal voltage ΔV₂ = 9 V.

c) Express the emf in terms of r, R and ΔV.

d) Find the numerical value of r in Ω.

e) Find the numerical value of ε in V.

Reference no: EM13997910

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