A rectangular resistor of 5.0 Q that is 10mm long, 2mm thick, and 2mm wide is in

Question

A rectangular resistor of 5.0 Q that is 10mm long, 2mm thick, and 2mm wide is in a circuit with a battery and light bulb. If the power dissipated in the resistor is 5 W, what is the voltage across the resistor? A resistor dissipates 1.5 W when it is connected to a battery with a potential difference of 12 V. What is the resistance of the resistor? A pair of light bulbs connected in series to a battery will draw less current than a single bulb would draw the same current that a single bulb would draw more current than a single bulb would draw A battery has a terminal voltage of 12 V when no current flows and an internal resistance of 2 Ohm The battery is placed in series with a 1 Ohm resistor. Which one of the entries in the following table is correct? Assuming that C1 = C2 = C3 = C4 = 1 mu F in the following diagram, what is the effective capacitance between points A and B? What was Kirchhoff s reward for inventing Kirchhoff s Laws?

Explanation / Answer

1) P = V^2/R

5 = V^2/5

V = 5V so a)

2) P = V^2/R

R = V^2/P = 12^2/1.5 = 96 ohms

3) higher resistance so less current

so a)

4)

so R total = 2 + 1 = 3 ohms

V = IR
I = 4A

so terminal voltage = V - IR = 12 - 2*4 = 12 - 8 = 4 V

so a)

5) combine 2 and 3

C2 + c3 = 2 uF

then C1 C23 and C4 are in series

1/1 + 1/1 + 1/2 = 2.5 = 1/C

C = 1/2.5= 0.4 uF

6) he got his doctorate

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