A 50 Ohm resistor is connected in parallel with a 100 Ohm resistor. Which of the

Question

A 50 Ohm resistor is connected in parallel with a 100 Ohm resistor. Which of the following statements are true ?

1. The total resistance is less than 50 Ohms
2. The two resistors have the same voltage across them.
3. The two resistors are connected back to back
4. All of these statements are true.


A circuit has a Thevenin equivalent circuit with Vth = 12 Volts and Rth = 50 Ohms. The load resistance that gives maximum power transfer is :

1. 100 Ohms
2. 600 Ohms
3. 50 Ohms
4. 12 Ohms
5. 25 Ohms

A circuit has a Thevenin equivalent circuit where Vth = 24 Volts and Rth=1000 Ohms. The Norton equivalent circuit will have Inor = ?.

1. 24 mA
2. 24 microamps
3. None of these
4. 240 mA
5. 2.4 Amps

A flashlight bulb draws a current of 250 mA from a 6 Volt battery. The amount of power that the bulb consumes is :

1. 1.50 Watts
2. 0.25 Watts
3. 6.00 Watts
4. 0.50 Watts
5. 1.00 Watts

Explanation / Answer

I'm not sure if you want explanation or just answers. Whenever you hear circuit elements in series, that means they share the same current. If they are in parallel, then they share the same voltage. Two resistors, R1 and R2 in parallel have equivalent resistance: Req = [(R1)(R2)]/(R1 + R2) Req will never be greater than the resistor with least resistance 1st question: 1.) Req = (50)(100)/(150) = 5000/150 = 500/15 = 100/3 < 50 It's true 2.) is true 3.) Not true, because parallel just means they share same pair of terminals, I could put a voltage source, a current source, another element in between. 4.) Speaks for itself SECOND QUESTION You need the load resistance to equal the Thevenin Resistance: R = 50 ohms 3RD QUESTION Inort = 24/1000 = 24 mA 4TH QUESTION power is voltage times current P = VI = (250x10^-3)(6) = 1.50 W 5TH QUESTION

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