Methods of charging
lighting&conductors
Current electricity
Static electricity
Drawing & solving circuits
100
What are the 3 ways of charging an object
Charging by Friction
By conduction
By Induction
100
Lightning is a giant spark caused by a buildup of what kind of electricity in storm clouds.
Static electricity
100
This is the flow of electric charge through a conductor.
Electric current
100
When you rub glass and wool together what charge will both OBJECTS become
Glass + wool -
100
What is the current in a 160V circuit if the resistance is 20Ω?
V=
I=
R=
Current = V/R = 160/20 = 8a
V = 160v
R = 20Ω
I = 8A
200
What is grounding
when electrons evenly pass to another OBJECTS
200
What causes the path creation of lightning during a thunderstorm
The negative charges in the cloud descend towards the Earth
200
The unit used to measure electric current.
Amp (A)
200
When an object has more electrons than protons, it has what type of charge.
When an object has more electrons than protons, it has this type of charge.
200
Solve this circuit with R1=15, R2 = 20, R3 = 5 and V1 = 10 V2 = 5 VT = 20 . solve for the RT and V3
RT = R1 + R2 + R3 = 15+20+5 = RT = 40
V3 = VT - V1 - V2 = 20 - 10 - 5 = V3 = 5v
300
This method of charging happens when a charged object directly touches another object, allowing electrons to flow.
Conduction
300
Why do metals conduct electricity better than non-metals?
Because metals have free electrons that can move easily and carry charge
300
This device is used to measure voltage in a circuit.
A voltmeter
300
If a negatively charged object touches a neutral object, what happens to the charge on the neutral object?
It becomes negatively charged through conduction.
300
Draw a circuit that contains a 3V battery, an ammeter and 3 light bulbs, Light 1 and the ammeter is connected in series, light 3 and 4 in parallel
400
When a balloon is rubbed on your hair and then sticks to a wall, it is an example of this method of charging.
Charging by friction
400
what are the difference between conductors and insulators and give 2 examples of each
A conductor allows electrons to flow easily while insulators resist the flow of the electrons es:
Gold plastic
Copper Rubber
400
This part of a circuit provides the energy that pushes the electrons.
A power source or battery
400
what happens when a charged object suddenly loses its charge to the ground or another object
Electric discharge
400
A 12 V battery is connected to two resistors in parallel:
R1=4 Ω =
R2=6 Ω =
RT=12Ω =
What is the current through each resistor?
VT = V1 = V2 = V1 = 12,V2 = 12 VT = 12
I2 = V2/R2 = 12/6 = I2=2A
V=12V
🔹 For R1=4 Ω
I1=R1/V= 12/4 =3A
🔹 For R2=6Ω
I2=V/R2=12/6 =2A
500
A negatively charged rod is brought near a neutral metal sphere. The sphere is grounded and then the rod is removed. What method of charging has occurred?
Induction
500
When there is a thunderstorm why would it be dangerous to seek shelter on a tall object
Tall objects are closer to the cloud and provide a shorter path for the electrons to discharge, making them more likely to be struck.
500
If you add more light bulbs in a series circuit, what happens to the brightness of each bulb, and why?
The brightness of each bulb decreases because the total resistance in the circuit increases, which reduces the current flowing through each bulb.
500
Why do you sometimes get a small shock when you touch a metal doorknob after walking on carpet
When you walk on the carpet, electrons build up on your body through friction. When you touch the metal doorknob, the electrons quickly move from you to the doorknob, causing a small static shock
500
A student is building a parallel circuit with two resistors and wants the total current to be 5 A when connected to a 10 V battery. One resistor is known:
R1=4 Ω
Tasks:
a) What is the current through R1
b) What current is needed through the second resistor?
c) What must the resistance of the second resistor be?
a)IT−I1=5−2.5=2.5A
b)R2=V/I2=10/2.5=4Ω
c)R2=V/I2=10/2.5=4Ω