Electric Force
Field lines go out of this charge.
Positive
Can you have a magnetic monopole? (a magnet with just a north pole, or just a south pole)
No, magnets must have opposite poles.
What are the two types of circuits we've learned about?
Series, and Parallel
Field lines go into this charge
Negative
A series circuit has resistances R1= 10Ω , R2 = 20Ω , R3 = 70Ω . What is the total resistance?
RT = 10+20+70 Ω
= 100Ω
Two same charges will ...
Repel
Do magnets exert a force?
Yes, the magnetic force. (you can push things, or attract things with magnets)
In this type of circuit, the current can follow multiple paths.
Parallel
Two opposite charges will ...
Attract
A circuit has a total resistance of 200 Ω and a current of 2A. What is the voltage in this circuit?
V = IR
= 2A*200Ω
= 400 V
Increasing the distance between two charged particles will have this effect on the Force
Decrease
Which of these two pictures shows a magnetized metal?
B
If a circuit has 4 resistors in parallel, each with a resistance of 2 ohms, what is the total resistance?
1/RT =(1/2)+(1/2)+(1/2)+(1/2)
= 2
RT = 1/2
If a positively charged particle goes through this electric field, what direction will in be pushed or pulled in?
(capture 2)
Up
What type of circuit is this?
(capture 4)
A combination circuit
If you remove electrons from an object it will...
Become Positively charged
Which layer of the Earth is responsible for the magnetic field?
- Atmosphere - Mantle
- Crust - Core
The Core
In this type of circuit, voltage drops over each resistor.
Series
If an electric field has a strength of 30 N/C, and you insert a charge of 2 C in it, what force will it experience?
E = F/Q
F = E*Q
= 30 N/C * 2C
= 60 N
What is the voltage drop across the first resistance? Current is 500 mA
ΔV = IR2
= (0.5A)(20Ω )
= 10V
If work is done by pushing two particles closer together, then what can we say about those particles?
They repel (they are the same charge).
What causes a metal to become magnetized?
When its electrons have their spin and rotation aligned
If your fridge runs at 600 KWh, and your power company charges $2 per kilowatt hour, how much will you owe the power company?
600 KWh X 2$/KWh = $1200
Find the electric force between two charges of + 2C at a distance of 3m.
F= (k*Q1*Q2)/d2
= ((9*109)(2)(2))/(32)
= (9*4*109)/ 9
= 4*109 N
Find the power in kilowatts in the current is 7500 mA and the voltage is 250 V.
P = IV
= (7.5A)(250V)
= 1875 W
= 1.875 kW