11. An electric heater carries a current of 20 A when operating at a voltage drop...
11. An electric heater carries a current of 20 A when operating
at a voltage drop of 120 V. According to Ohm’s
law, if I double the voltage drop across the heater, what happens
to the current passing through it?
a. Nothing, as the current passing through an electrical component
is independent of the voltage drop.
b. It doubles in value to 40 A
c. It halves in value to 10 A
d. It rises by a factor of 4 to 80 A
e. It drops by a factor of 4 to 5 A
Homework Answers
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11. An electric heater carries a current of 20 A when operating
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In hemodynamics, blood flow through the cardiovascular system
can be modeled as an electric circuit in which the blood serves as
electricity, the blood vessels as resistive wires, and the heart as
a battery (see Figure 1).
Figure 1 Cardiovascular circuit model
Ohm’s law states that the voltage drop ΔV across each element,
the current I flowing through it, and its electrical
resistance R are related by ΔV = IR. In a blood vessel, pressure
difference between one vessel and...
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