The model of electron conduction you saw in lab involved thinking of electrons a

Question

The model of electron conduction you saw in lab involved thinking of electrons as "marbles" that move along a "conductor". But the marbles keep bumping into the pegs that represent the atoms, losing energy in each "collision" along the wire and thus the marbles eventually run out of energy (stop). What is required to keep the marbles moving? What are the magnitude and direction of the current in the fifth wire? What is the equivalent resistance of the group of resistors shown? What is the current in the circuit; assume ideal wires?

Explanation / Answer

1.

To keep the marbles moving , we need electric field parallel to direction of motion of marbles which provid a constant force to move it.

2.

using conservation of charge

assuming current going away as negative and current coming in as positive

let "i" be the current in fifth wire

sum of currents = 0

3 + 4 - 6 - 2 + i = 0

i = 2 A

since "i" is positive, the current is going inward

3)

15 , 5 and 8 ohm are in series and their combination is given as

Rtotal = Total resistance of circuit = 15 + 5 + 8 = 28 ohm

V = battery Voltage = 9 Volts

i = current in wire

using ohm';s law

V = iRtotal

9 = 28 i

i = 0.32 A

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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