4. What is the resistance (R) of the resistor if the
electric current (I) flowing through this resistor is equal to 2 A, and the
electric potential (VL) on the left terminal of this resistor is 4 V and
the electric potential (Vr) on the right terminal
of this resistor is 10 V. Which is direction of the electric current through
this resistor, toward left or right?
Vr - VL = ΔVr,l = -Ir,l R
-Ir,l R = (Vr - VL )
Vr - VL = ΔVr,l = -Ir,l R
-Ir,l R = (Vr - VL )
-Ir,l = (Vr
- VL
)/R
Ir,l = (VL
– Vr
)/R
R = |(VL
– Vr
)/
Ir,l |
R = |(4V – 10V )/2A| = 3
Ω
The electric current flows from greater potential, 10V,
right, to the lower potential, 4V, left: toward to left.
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