Ohms Law

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CURRENT, POTENTIAL DIFFERENCE and OHM’S LAW
PART A: CURRENT I 
Q
t
1) One _______________ is equal to one coulomb per second.
2) If 144 C of charge passes a point in a conductor in 3.0 min, what is the current through that point?
3) Find the current in a conductor when 24 C of charge pass a point in the conductor every 30 s.
PART B: POTENTIAL DIFFERENCE V 
E
Q
1) One _______________ is equal to one joule per coulomb.
2) If 42 J of chemical energy in a battery places 7.0 C of negative charge at the negative terminal, leaving a
deficit at the positive terminal, what is the potential difference between the negative and positive terminals
of the battery?
3) Find the potential difference between the terminals of a battery that uses 180 J of chemical energy to
separate 20 C of charge.
PART C: OHM’S LAW V  IR
1) One _______________ is equal to one volt per ampere.
2) If a wall outlet provides a potential difference of 120 V and a current of 8.6 A through the heating coil in a
toaster, what is the resistance of this heating coil?
3) Find the resistance of a light bulb if 2.4 A runs through it, when a potential difference of 12 V is placed
across the light bulb.
4) Copy and complete the following table:
V (potential difference)
120 V
6.0 V
4.0 V
I (current)
12.5 A
6A
0.20 A
0.5 A
120 V
R (resistance)
36 
24 
240 
100 
5) The resistance of a tungsten filament in a light bulb is 144  and a current of 0.833 A is flowing through it.
What is the voltage drop across the light bulb?
Part A: 1) ampere, 2) 0.8 A, 3) 0.8 A, Part B: 1) volt, 2) 6 V, 3) 9 V
Part C: 1) ohm, 2) 14 , 3) 5, 4) 9.6 , 216 V, 0.25 A, 20 , 120 V, 1.2 A, 5) 120V
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