Problem 5 please CO Sécurisé l https //capa.mcgiil.ca/uploaded/mogilw4c20042e969

Question

Problem 5 please

CO Sécurisé l https //capa.mcgiil.ca/uploaded/mogilw4c20042e9695458bamogill2/default 48657 6066page False The cuITent through resistor is the same in circuits A and C False The power dissipated in circuit A is twice the power dissipated in circuit B The current through a resistor is the sane in circuits A and B True False The total power dissipated un curcurt C is twice the total power dissipated in circuit B. Due in 18 hours, 34 mioutes Submit Answer Incorrect Tries 2/6 Preiou Problem 5 a) A battery with an enuf of 12.00 V has an interral resistance r When connected to a resistor R. the terminal voltage is 11.70 Vaad the current is 40 A. What is the value of the extemal resistor R? Answer Tries 0/6 b) What is the untenal resistance rof the battery? Submit Answer Tries 0/6 e) What is the energy dissipated in the battery' iatemaal resistance in 4.70 minutes? Submit Answer Tries 0/6 Due in 18 hours Problem 6 La A copper wire ofradus 3.0mm carries a constant current of30 mA. Find the average drift velocity of the electrons if the density of copper is 9000 kg assuming one conduction electron per copper aton. Due in 18 hours, 34 minutes Submit Answer Tries 0/6 La Problem a) The intemal resistance of a battery whose emfis 28.8 V varies with the current according to the equation r (a-b*I. where a 0.170 2 and to 0.020 S2/A. What is the terminal voltage of the battery when 2.0 A A ENG 1925

Explanation / Answer

5)

a)

E = emf of battery = 12 volts

V = terminal Voltage = 11.70 volts

R = external resistance

r = internal resistance

i = current= 0.14 A

for the external resistance

V = iR

11.70 = (0.14) R

R = 83.6 ohm

b)

also , V = E - i r

11.70 = 12 - (0.14) r

r = 2.14 ohm

c)

t = time = 4.70 min = 4.70 x 60 sec

energy dissipated in internal resistor

E = i2 r t = (0.14)2 (2.14) (4.70 x 60) = 11.83 J

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