Question

An 8.00- W resistor is dissipating 100 watts. What are the current through it and the difference of potential across it?
       12.5 A, 28.3 V
       3.54 A, 12.5 V
       3.54 A, 28.3 V
       28.3 A, 3.54 V
2. When will an egg float in water?
    a.  
An egg always floats in water
    b.  
An egg can never float in water
    c.  
By adding salt to the water, the egg will begin to float
    d.  
When the water is very cold

3.Which is a unit of power?
       kWh
       W/s
       A×W
       J/s
3.The unit of work, joule, is dimensionally the same as:
       newton/second.
       newton/kilogram.
       newton-second.
       newton-meter.

Answer 1

solution-

1) 28.3V,3.54A

We know the power P=V^2/R

therefore V==

and power P=I^2R

and I=

2)(c).By adding salt to the water, the egg will begin to float

note- density of the average egg will be slightly greater than that of water, so it will sink. To make an egg float, we have to make the water more dance by adding salt

3)J/s

power=energy(J)/time(second)

4)newton-meter

work done=force(N)*displacement(m)