Three resistors are connected in series across a 16-V power supply. If the poten

Question

Three resistors are connected in series across a 16-V power supply. If the potential drops across resistors 1 and 2 are 4.9 volts and 2.9 volts, what is the exact potential drop (in volts) across resistor 3?

A 216-O and a 212-O resistor are connected in series across an unspecified power supply. If the current through the 216-O resistor is 0.95 A, what is the exact current (in A) through the 212-O resistor?

A battery supplies 0.71 A to three resistors connected in parallel. The current through the first resistor is 0.27 A and the current through the second resistor is 0.24 A. What is the exact current (in A) through the third resistor?

A 134 O resistor and a 131 O resistor are both connected in parallel across a power supply. If the potential drop across the 134 O resistor is 18 V, what is the exact potential drop (in V) across the 131 O resistor?

There is 79 V across a 21-O resistor. What is the power dissipated by the resistor (in W)?

Explanation / Answer

1. three resistors
V=V1+V2+V3
16V = 4.9V + 2.9 V + V3
16V=7.8V + V3
V3 = 8.2 V

2. 216 & 212

the resistors are in series

if 216 has i = 0.95 A

then 212 has i = 0.95A

3.batter

i = 0.71A

i1 = 0.27A

i2 = 0.24A

i = i1 + i2 + i3

0.71 A = 0.27 A + 0.24 A + i3

i3 = 0.20 A

4. 134 resistor & 131 resistor in parallel

134 has 18 V so 131 has 18 V

both have the same potential drop since they are in parallel

5. 79 V & 21

P = V2/R

P = (79V)2/21

P = 297 W

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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