show work! A transformer can be used for \"stepping up\" or \"stepping down\": (
ID: 2078178 • Letter: S
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show work!
A transformer can be used for "stepping up" or "stepping down": (a) the voltage of alternating current (AC) only. (b) the voltage of direct current (DC) only. (c) the power of alternating current (AC) only. (d) the power of direct current (DC) only. (e) the voltage of any current - it doesn't really matter whether AC or DC is used. (f) the power of any current - it doesn't really matter whether AC of DC a used At the current mining rate, the global coal resources will last, approximately, for another: (a) 10 years; (b) 40 years; (c) 120 years. d) 400 years Except for regions of high volcanic activity, or close to tectonic plate boundaries, the geothermal gradient value is usually close to: (a) 3 degree C per 1 km. (b) 30 degree C per 1 km; (c) 300 degree C per 1 km; d) 3000 degree C per 1 km. Earth's interior is hot, and this thermal energy can be harnessed to generate geothermal power. (a) The main reason the Earth's interior is hot is the "primordial heat" that was created when the planet first from cosmic debris - after over four billion years, much of that heat is still there, (b) The main source of heat in the Earth's interior is the decay of long travel radioactive nuclei; (c) The main source of this heat are the chemical reaction between various minerals in the deep planet's layers; (d) The heat in the planet's interior is yet another form of converted solar energy as wind power, wave power, hydropower and biofuels are. The relation between the Ohm. Volt and Ampere is: (a) 1 Ohm = 1 V middot 1 A; (b) 1 Ohm = 1 V/1 A; c) 1 Ohm = 1 A/1 VExplanation / Answer
9) a) voltage of alternating AC only
10) c) 120 years
11) b) 30 degrees per 1 km
12) b) the main source of heat in the earth's interior is the decay of long lived radioactive nucleui
13) from ohms law
v=iR
R=v/i
1ohm= 1V/1A (b)
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