use information below, fill in the blanks battery emp= 18 V battery A: current=

Question

use information below, fill in the blanks

battery emp= 18 V

battery A: current= 450 mA and voltage difference= 9V

battery B: current= 450 mA and voltage difference= ?

battery C: current=270 and voltage difference= 5.4V

battery D: current= 180 and voltage difference=?

?Rank the bulbs by resistance, from highest to lowest. Ties are possible. Use the symbols > and = to indicate your rankings, listing any that are equal in alphabetical order.

Rank the bulbs by brightness, from highest to lowest. Ties are possible. Use the symbols > and = to indicate your rankings, listing any that are equal in alphabetical order

Explanation / Answer

Va +Vb+Vc=18

18-14.4=Vb=3.6V

Vd = Vc = 5.4V

Ra=Va/Ia=9/.450=20 ohms

Rb=Vb/Ib=3.6/.450=8 ohms

Rc=5.4/.270=20 ohms

Rd=5.4/.180=30 ohms

Rd>Ra=Rc>Rb

Pa=Ia*Va=.450*9=4.05 W

Pb=Ib*Vb=.450*3.6=1.62W

Pc=Ic*Vc=.270*5.4=1.458W

Pd=Id*Vd=.180*5.4=.972W

Pa>Pb>Pc>Pd

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