Electricity review
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Electricity Review. A closed circuit : a.is off. b.is on. c.has a break in it. Positive electric charges : a.attract both positive charges and negative charges. b.repel positive charges and attract negative charges. c.attract positive charges and repel negative charges.

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Electricity Review

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Electricity review

Electricity Review


Electricity review

A closed circuit:

a.is off.

b.is on.

c.hasa break in it.


Electricity review

Positive electric charges:

a.attractboth positive charges and negative charges.

b.repelpositive charges and attract negative charges.

c.attractpositive charges and repel negative charges.


Electricity review

Suppose you rub an inflated party balloon on a carpet, hold the balloon next to a wall, and discover that it "sticks" to the wall. Why did the balloon stick to the wall?

a.Likecharges on the balloon and wall cause an attraction between the two.

b.Balloonscontain a special "atomic glue" that allows them to cling to other objects.

c.Excesscharge builds up on the balloon and electrostatic forces allow the balloon and wall to be attracted to one another because they are oppositely charged.


Electricity review

Almost all of the electrons flowing through a battery circuit come from:

a.thewires in the circuit..

b.chemicalreactions of the light bulbs.

c.thebattery.


Electricity review

Electrical current will pass most easily through:

a.an insulator.

b.aconductor.

c.asemiconductor.


Electricity review

Which of the following could be a good conductor of electricity?

a.Ametal pot

b.Aceramic coffee cup

c.Apiece of foam packing material


Electricity review

Which of the following statements best describes the difference between series and parallel circuits?

a.Seriescircuits are battery circuits and parallel circuits are generator circuits.

b.Seriescircuits have a single path and parallel circuits have two or more paths.

c.Seriescircuits are used in computers and parallel circuits are used in homes.


Electricity review

Your house is wired in

a.series.

c.notenough information is given.

b.parallel.

d.in with Walmart’s power system to save money.


Electricity review

If the above charges are attracted, the second charge must be

a.neutral

c.negative

b.positive


Electricity review

If two light bulbs are in series and you unscrew one of them, the other light bulb will

a.becomebrighter.

c.turnoff.

b.become dimmer.

d.be short circuited.


Electricity review

An object becomes positive when

a.it gains protons.

c.it loses electrons.

b.it gains electrons.

d.it loses protons.


Electricity review

Potential differences cause

a.electronsto move from the positive terminal to the negative terminal.

b.electronsto move from the negative terminal to the positive terminal.

c.protonsto move from the positive terminal to the negative terminal.

d.protonsto move from the negative terminal to the positive terminal.


Electricity review

The brightness of a light bulb is determined by its filament’s

a.voltage.

c.watts.

b.amperes.

d.resistance.


Electricity review

Conventional current is defined as the movement of

a.positivecharge.

c.negativecharge.

b.variablecharge.

d.net charge.


Electricity review

The rate at which charges move through a conductor is called

a.voltage.

c.current.

b.resistance.

d.electricalpotential energy.


Electricity review

Individual components in a parallel circuit experience the same

a.voltage.

c.power.

b.current.

d.dissipation.


Electricity review

A device that protects a circuit from current overload is called a

a.resistor.c.circuit breaker.

b.capacitor.d.closed circuit


Electricity review

The SI unit of resistance is the

a.volt.

c.ohm.

b.ampere.

d.joule.


Electricity review

Potential difference is measured in

a.amperes.

c.coulombs.

b.volts.

d.joules.


Electricity review

Calculate the resistance of a bulb that draws 0.6 A of current with a potential difference of 3 V.

a.0.2 ohms

c.5 ohms

b.1.8 ohms

d.15 ohms


Electricity review

A 6.0-V battery is connected to a 24- resistor. What is the current in the resistor?

a.0.25 A

c.18 A

b.4.0 A

d.144 A


Electricity review

A device connected to a 120-V outlet has 2.0 A of current in it. What is the power of this device?

a.48 W

c.240 W

b.60 W

d.480 W


Electricity review

What is the potential difference across a resistor that dissipates 5.00 W of power and has a current of 5.0 A?

a.1.0 V

c.125 V

b.4.00 V

d.0.20 V


Electricity review

There is a potential difference of 12 V across a resistor with 0.25 A of current in it. The resistance of the resistor is

a.48 ohms.

c.12 ohms.

b.24 ohms.

d.0.021 ohms


Electricity review

A resistor has a resistance of 280 . How much current is in the resistor if there is a potential difference of 120 V across the resistor?

a.160 A

c.0.12 A

b.0.43 A

d.2.3 A


Increase or decrease

If I increase the voltage, the current will _______

If I increase the resistance the current will ________.

If I add more batteries, the brightness of the light bulbs will ________.

If my current increased, there must have been a __________ in resistance.

If I add more bulbs to a series circuit, the brightness of each bulb will _______.

Increase or Decrease?


Open circuit voltage resistance current closed circuit

A path through which electricity can travel.

The pressure or push that moves electricity.

Reduces the amount of electricity flowing.

The flow of electrons thru a circuit.

When there is a break in the path; electricity can’t flow

open circuitvoltage resistance currentclosed circuit


Capacitor led photocell potentiometer resistor

____36. Works as a variable resistor

____37. Stores electrical energy.

____38. Works as a light sensitive resistor.

____39. The value affects the brightness of an LED

____40. Light Emitting Diode

CAPACITORLEDPhotocellPotentiometerresistor


555 timer bread board diode ic speaker

____41. Another name for a solderless circuit board.

____42. Transforms electrical energy (the current flowing through it) into sound waves.

____43. Allows current to flow through it in only one direction.

____44. Provides a continuous series of pulses. Acts like a clock.

____45. Integrated Circuit

555 timerbread boarddiodeICspeaker


Electricity review

An electrician wires the entire kitchen in your home in series. Included in the circuit are the refrigerator, overhead electric lights, and the outlets to which the toaster and the microwave oven are connected. In order to keep the refrigerator operating properly, what would have to happen with the other electrical appliances and lights?


Electricity review

If a person were able to hold onto a high voltage wire suspended in air, what would happen?

And why?


Electricity review

  • What is the voltage of a battery that produces 7 amps through a 4 ohm circuit?


Electricity review

  • How much current flows thru a 12 ohm circuit when 6 volts is applied?


Electricity review

  • How much power is used in a circuit that has 2 amps flowing through it and 9 volts applied to it?


Electricity review

Draw the following circuit: 2 batteries; 2 resistors in series; switch.


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