Charges
Coulomb's Law
Electric Fields
Circuits
Anything goes
100
What are the units of charge?
Coulombs
100
State Coulomb's Law (math or words are ok).
Felectrical =
k*(Qa * Qb)/d^2
100
What are the two equations we can use to find the electric field created by a charge?
E =F/q=k**Q/d^2
100
As more resistors are added in series, what happens to the total resistance of the circuit?
The total resistance increases.
R_(abc)=R_a+R_b+R_c
100
What is Dr. Doofenshmirtz's favorite food?
Almond Brittle.
200
Protons orbit around the nucleus of an atom.
True or false?
False. Protons form the nucleus of the atom, along with neutrons.
200
Charge A is +2 C and Charge B is -4C. The force of A on B is 50 N. What is the magnitude of the force of B on A?
50 N. These forces are action reaction pairs.
200
What are the units of electric field?
Newtons per Coulomb
N/C
200
As more resistors are added in parallel, what happens to the total resistance of the circuit?
The total resistance decreases.
1/R_(abc)=1/R_a+1/R_b+1/R_c
200
In the circuit below, which element consumes the energy flowing through the circuit?
D. The resistor.
300
Electrons have a charge of -1 Coulomb
True or False?
False. Electrons have a charge of -1.6 x 10-19 Coulombs.
300
Like charges ______ and opposite charges ______.
Fill in the blanks.
Like charges REPEL and opposite charges ATTRACT.
300
Consider the electric field shown below. What are the signs of Charge A and Charge B?
Both charges are positive. Electric field lines are directed away from positive charges and towards negative charges.
300
Three identical 4-ohm resistors are connected in series to a 24 V battery. What is the total resistance of the circuit?
R_(abc)=R_a+R_b+R_c=4+4+4=12 ohms
300
What are the powers of the three Madrigal children (Pepa, Bruno, and Julieta)?
Pepa controls the weather with her mood, Bruno (we don't talk about Bruno) can see the future, and Julieta's cooking has healing powers.
400
Electrons have a negative charge.
True or false?
True. Electrons are negative charges, protons are positive, and neutrons don't have a charge at all.
400
A +5 C charge is located 2 meters away from a -3 C charge. What is the magnitude of the electrical force between them?
33.75 x 109 Newtons. It is an attractive force, since they're opposite charges.
400
Consider the electric field below. Which charge is bigger?
Both charges are the same. The number of electric field lines is proportional to the amount of charge and both charges in the diagram have the same number of lines.
400
Three identical 4-ohm resistors are connected in parallel to a 24 V battery. What is the total resistance of the circuit?
1/R_(abc)=1/R_a+1/R_b+1/R_c
=1/4+1/4+1/4= 3/4
1/R_(abc)=3/4 ->R_(abc) = 4/3= 1.3 ohms
400
Fiona the hippo now weighs a healthy 1500 pounds. What is her weight in Newtons?
1 lbs = 0.45 kg OR 2.2 lbs = 1 kg
Fiona weighs about 6800 Newtons!
500
The smallest possible amount of charge is 1.6 x 10-19 Coulombs.
True or False?
True. Electrons and protons are the smallest charged particles.
500
Three charges are places along a straight line. Charge A is -3 C, placed 2 meters from Charge B, which is +4 C. Charge C is placed on the other side of Charge B. Charge C is -6 C and is placed 1 meter away from Charge B. What is the net force (magnitude and direction) on Charge A?
The net force on charge A is 9 x 109 Newtons towards Charges B and C.
500
The electric field at a Point A is measured to be 2.3 x 109 N/C to the right. What is the electrical force that a -2 Coulomb charge would experience when placed at point A? Give magnitude and direction.
4.6 x 109 C to the left.
E=F/q -> F=E*q = 2.3*10^9 xx2= 4.6*10^9 N
500
Three identical 7-ohm resistors are connected in parallel to a 24 V battery. What is the current through each resistor?
1/R_(abc)=1/R_a+1/R_b+1/R_c=1/7+1/7+1/7
R_(abc)= 7/3 = 2.33 ohms
V=I*R -> 24=I*2.33 ->I=10.3 Amps
500
Name these muppets.
Beaker and Dr. Bunsen Honeydew