Electrostatics
Current & Circuits
Coulomb's Law
Ohm's Law
Power & Mystery
100
Two positive charges one with a charge of +4Q and the other with a charge of +Q are separated by a distance of r.
Is the force between the objects attractive or repulsive or neutral?
Repulsive
100
Which of the following is the formula for current?
A. V=IR
B. P=IV
C. I= q/t
D. F=ma
q/t
C. I=q/t
100
Consider Coulomb's Law.
What does the r stand for?
A. charge on object 1
B. charge on object 2
C. electrostatic force between objects
D. distance between objects
D. distance between objects
100
Which equation is not a version of Ohm's Law?
A. V = IR
B. I = V/R
C. R = V/I
D. I = R/V
D. I = R/V
V = IR
I = V/R
R = V/I
100
True or False
The SI unit for current is ohms.
FALSE
The SI unit for current is amps.
200
An object possesses an excess of 9x1013 electrons. The type of charge of the object is positive or negative?
Negative
200
How much current would flow in a circuit with 20 Coulombs of charge over 10 seconds?
A. 200 amps
B. 2 amps
C. 0.5 amps
D. 20 ohms
B. 2 amps
I = q/t = 20/10
200
Looking at the diagram below there are three particles with the same magnitude of charge.
Charge q1 is located at the origin, Charge q2 is located 1m from the right of the origin, and Charge q3 is located 0.75m to the right of the origin.
Which direction will the positive charge q3 start to move?
A. Right
B. Left
C. It won’t move.
A. Right
200
If the current in the circuit is 7 amps and the resistance is 2 ohms, the voltage is ____ volts.
14 volts
V = IR = (7)(2) = 14
200
Two positive charges one with a charge of +4Q and the other with a charge of +Q are separated by a distance of r.
Which of the following statements is true?
A. The greater charge exerts a larger force on the smaller charge.
B. The greater charge exerts a smaller force on the smaller charge.
C. Both Charges experience the same force in opposite directions.
D. Both Charges experience the same force in the same direction.
C. Both Charges experience the same force in opposite directions.
300
An object possesses an deficit of 9x1013 electrons. The type of charge of the object is positive or negative?
Positive
300
Can current flow through a closed circuit?
Yes
300
Looking at the diagram below there are three particles with the same magnitude of charge.
Charge q1 is located at the origin, Charge q2 is located 1m from the right of the origin, and Charge q3 is located 0.75m to the right of the origin.
Which charge will exert the most force onto the positive charge q3?
A. q1
B. q2
C. Both charges will exert the same force.
B. q2
300
Which equation would you use to solve the following problem?
A circuit contains a 9 volt battery and a bulb with a resistance of 3 ohms. Calculate the current.
A. I = q/t
B. V = IR
C. I = V/R
D. R = V/I
C. I = V/R
300
Which of the following is not a valid equation for Power?
A. P = IV
B. P = I2R
C. P = I/R2
D. P = V2/RC. P = I/R2
B. Uses P = IV & V = IR
D. Uses P = IV & I = V/R
400
To calculate the charge on an object with an excess of 5 electrons, you must ________________ 5 and -1.6x10-19.
Add, Subtract, Multiply, or Divide
Multiply
400
If a small appliance is rated at a current of 10 amps and a voltage of 12 volts, the power rating would be ___________ Watts.
A. 1200
B. 1.2
C. 120
D. 20
C. 120
P = IV = (10)(20) = 120
400
Consider Coulomb's Law. 
What happens to the force between objects when the charge on one of the objects is doubled?
A. It is halved
B. It is quadrupled
C. It is doubled
D. It is changed by 1/4
C. It is doubled
400
A circuit contains a 9 volt battery and a bulb with a resistance of 3 ohms.
Calculate the current.
3 amps
V = IR so I = V/R = 9/3 = 3
400
Match the symbol to the device commonly found in a circuit.
Resistor
Fuse
Load
Fuse
Resistor
Load
500
__________________ is a simplified model of a charge that is assumed to occupy a single point in space.
__________________ is the study of stationary electric charges and their interactions.
__________________ is a subatomic particle with a negative charge.
__________________ is the SI unit of electric charge.
__________________ is the force exerted by stationary electric charges.
Electron Electrostatics Point Charge Electrostatic Force Coulomb
Point charge
Electrostatics
Electron
Coulomb
Electrostatic Force
500
Tommy runs his juicer every morning.
The juicer uses 90 W of power and the current supplied is 45 A.
How many volts are necessary to run the juicer?
2 volts
P = IV so V = P/I = 90/45 = 2
500
Consider Coulomb's Law.
What happens to the force between objects when the distance is doubled?
A. it is halved
B. it is quadrupled
C. it is doubled
D. it is changed by 1/4
D. it is changed by 1/4
500
Which of the following would increase resistance in a wire?
CHOOSE 4!!
A. Having a shorter wire
B. Having a more conductive wire
C. Having a thinner wire
D. Having a longer wire
E. Having a less conductive wire
F. Lower temperature
G. Having a thicker wire
H. Higher temperature
C. Having a thinner wire
D. Having a longer wire
E. Having a less conductive wire
H. Higher temperature
500
Which bulb will light?
c.