1- An ideal Voltmeter is connected across the terminals of a 12 Volt battery and

Question

1- An ideal Voltmeter is connected across the terminals of a 12 Volt battery and a light bulb with R = 4.5 ohms is also connected across the battery terminals. The Voltmeter reads 9.0 Volts.

(a) Draw and label a figure using electrical symbols

(b) Find the current, I, in the curcit.

(c) Find the internal resistence, r, of the battery.

(d) Find the power generated by the Emf of the battery.

2- The current in a wire varies with time as: I = 4.0A - (0.2A/s)t.

Find the charge, Q, that passes through a cross section of the wire in the time interval between t = 0s and t = 5.0s.

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Explanation / Answer

b)as voltmeter reads 9 volts,current through bulb=9/4.5=2 A

c)internal resistance=r(let)

then 12-r*2=9

r=1.5 ohms

d)power generated=12*2=24 W

Q2.charge=integral of I*dt

=integral of (4*dt - 0.2*t*dt)

with t from 0 to 5.

=4*t-0.1*t^2

=4*5-0.1*5^2=17.5 C

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