4.00 6.00 R1 2.00 4.00 8.00 4.00 Fig. 1 8.00 Fig. 2 Fig. 3 5. Resistors in combi

Question

4.00 6.00 R1 2.00 4.00 8.00 4.00 Fig. 1 8.00 Fig. 2 Fig. 3 5. Resistors in combination: In Fig. 1 above,(a) what is the total resistance between points a and b? (b) What is the potential difference between points c and d? (c) If you connected a fifth resistor with resistance R between points c and d, how would this affect the total resistance between points a and b? More resistors in combination: In Fig. 2 above, (a) what is the total resistance between points a and b? (b) If the potential difference between points a and b is 12V, what is the current in each resistor? (c) What is the voltage drop across cach resistor? (d) If the resistors are bulbs, how brightly is each one glowing (in Watts)? Comprehensive review of circuits: Fig. 3 above shows a circuit fragment known as a voltage divider. (a) If you take away Rload, show that Vout = VRz/(R1 + R2). (b) Now put back Rkud. If R.-R.-10 , what is the minimum value of Rload for which Kot drops by less than 10% from! its unloaded value? [Hints,' in (a), RL= 0 so there is only one loop. Find the current, and note that Vout is the voltage across R2. In (b), treat the combination of R: and Rt as Rp. You can find Rp from the rules by combining resistors. Let Vout be the voltage across Rp and require V,out =-Vout.] 6. 7.

Explanation / Answer

solving 1st question

Q5

The net resistance is given as follows

the above 2 resistance are inseries and below 2 resistance are also in series and they are in [parallel so

net resistance=Rnet=1/(1/2R +1/2R)=R

It forms balanced wheatstone bridge so voltage difference between c and d is zero

If R is connected between c and d ,the Rnet will still be same as Vcd=0.So no effect

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.