Ten
<em><u>Discussion</u></em>
Wattage is defined as W = Joules / second which means there is an energy transfer of so many joules / second.
A sounds like current
B is the answer. Read what B says and then read the definition above. Does that not sound like Energy over time?
C I don't have any idea what that is. It is just an answer, which does not make it right.
D. Slows? Sounds like resistivity or it is material dependent. It is not the answer.
Eleven
I'm not sure what answer is expected, but I'll do the calculations to justify my answer.
Total Resistance = 15 ohms.
E = 9 volts
I = E/R = 9/15 = 3/5
<em><u>Wattage 5 ohm resistor</u></em>
W = I^2 * R
W = 0.6^2 * 5
W = 1.8 Watts
<em><u>Wattage 10 ohm resistor</u></em>
W = I^2 * R
W = 0.6^2 * 10
W = 3.6 watts.
Now here's the point of the problem. Wattage = Energy / Time. Time is a constant. The only thing that can make the wattage go up Energy dissipated. That said, the 10 ohm resistor has the higher energy, because it has the higher power dissipation.
Answer: B
Twelve
This is a really handy problem to know the answer to. It determines how determine your electrical bill. Don't leave any appliance on beyond your immediate needs.
Total Wattage
The total wattage of this circuit is the total of the three appliances added together.
W1 = 240
W2 = 120
W3 = 780
Total Wattage = 1140
Formula
W = E*I
W = 1140
E = 120
I = ??
1140 = 120* I
1140/120 = I
I = 9.5
Answer: 9.5 or D
