Physics Unit Physics Unit ReviewReview

Static ChargeStatic Charge

►What is the definition of static electricity?What is the definition of static electricity?

A: An excess of charges that stay in A: An excess of charges that stay in place on an object for a period of place on an object for a period of time.time.

► Is the object positively, negatively, or Is the object positively, negatively, or neutrally charged?neutrally charged?

A: Neutrally chargedA: Neutrally charged

►How are all solid materials charged?How are all solid materials charged?A: The transfer of electrons.A: The transfer of electrons.

►Materials that do not allow charges to Materials that do not allow charges to move easily are called _________?move easily are called _________?

A: InsulatorsA: Insulators

►What are good conductors?What are good conductors?A: MetalsA: Metals

ChargeCharge

►What does the addition or removal of What does the addition or removal of

6.25 x 106.25 x 101818 electrons produce? electrons produce?

A: A coulomb of charge.A: A coulomb of charge.

►What machine uses friction to produce What machine uses friction to produce a large static charge on a metal dome a large static charge on a metal dome called?called?

A: Van de Graaff generatorA: Van de Graaff generator

Laws of Static ChargeLaws of Static Charge

► A negative charge is repelled by a __________ charge.A negative charge is repelled by a __________ charge.A: A negative charge.A: A negative charge.► A positive charge _________________a negative A positive charge _________________a negative

charge.charge.A: AttractsA: Attracts► A charged object _______________ a neutral object.A charged object _______________ a neutral object.A: AttractsA: Attracts► A negative object attracts an unknown object. The A negative object attracts an unknown object. The

unknown object could be ____________ or ___________.unknown object could be ____________ or ___________.A: Neutral or positive chargeA: Neutral or positive charge► A positive object ________________ a positive object.A positive object ________________ a positive object.A: RepelsA: Repels

Charging by Conduction or Charging by Conduction or InductionInduction

►Which of the diagrams shows charging Which of the diagrams shows charging by induction?by induction?

A: A and DA: A and D

VoltageVoltage

►What energy does electrochemical What energy does electrochemical cells convert into electrical energy?cells convert into electrical energy?

A: Chemical energyA: Chemical energy

►What is another name for the electric What is another name for the electric potential energy per coulomb of potential energy per coulomb of charge?charge?

A: VoltageA: Voltage

VoltageVoltage

► Calculate the voltage for the diagram found Calculate the voltage for the diagram found below.below.

A: 35 V A: 35 V

VoltageVoltage

►Calculate the voltage for the diagram Calculate the voltage for the diagram found below.found below.

A: 9 VA: 9 V

CircuitsCircuits

► A complete pathway that allows electrons to A complete pathway that allows electrons to flow is called _________?flow is called _________?

A: Electric circuitA: Electric circuit

► Any device that transforms electrical energy Any device that transforms electrical energy into other forms of energy is called ______?into other forms of energy is called ______?

A: Electric loadA: Electric load

►What direction do electrons flow through a What direction do electrons flow through a circuit?circuit?

A: Negative to positive.A: Negative to positive.

CircuitsCircuits

► State the parts of the circuit found in the State the parts of the circuit found in the diagram below.diagram below.

A: 2 lamps, a switch, a battery, an A: 2 lamps, a switch, a battery, an ammeter, and a voltmeter ammeter, and a voltmeter

CurrentCurrent

►Define current.Define current.A: The amount of charge passing a point A: The amount of charge passing a point

in a conductor every second.in a conductor every second.

► Convert 2400 mA to amperes.Convert 2400 mA to amperes.A: 2.4 AA: 2.4 A

► Convert 0.35 A to mA.Convert 0.35 A to mA.A: 350 mAA: 350 mA

CurrentCurrent

►Calculate the current at I3.Calculate the current at I3.

A: 4 AA: 4 A

CurrentCurrent

►Calculate the current at I2, I3, and I5.Calculate the current at I2, I3, and I5.

A: I2 and I3 = 6A and I5 = 2AA: I2 and I3 = 6A and I5 = 2A

ResistanceResistance

►Define resistance.Define resistance.A: A property of any material that slows A: A property of any material that slows

down the flow of electrons and down the flow of electrons and converts electrical energy into other converts electrical energy into other forms of energy.forms of energy.

► State Ohm’s Law.State Ohm’s Law.A: R = V/IA: R = V/I

►What is the unit for resistance?What is the unit for resistance?A: Ohm’sA: Ohm’s

► Give the value of each resistor indicated Give the value of each resistor indicated by the colour bands.by the colour bands.

a)a) Blue, green, redBlue, green, red

A: 652 ohmsA: 652 ohms

b)b) Green, orange, yellowGreen, orange, yellow

A: 534 ohmsA: 534 ohms

c)c) Brown, red, blackBrown, red, black

A: 12 ohmsA: 12 ohms

ColourColour BlacBlackk

BrowBrownn

ReRedd

OrangOrangee

YelloYelloww

GreeGreenn

BluBluee

NumericNumeric

ValueValue00 11 22 33 44 55 66

Ohm’s LawOhm’s Law

►Only 2.5 × 10Only 2.5 × 1033 A of current pass A of current pass through a portable CD player. If the CD through a portable CD player. If the CD player is operated by a 9.0 V battery, player is operated by a 9.0 V battery, what is the resistance within the what is the resistance within the circuit? circuit?

A: 3600 ohmsA: 3600 ohms

Ohm’s LawOhm’s Law

►An automobile headlight has an An automobile headlight has an average average resistance of 24 resistance of 24 . Car batteries . Car batteries provide a potential difference of 12 V. provide a potential difference of 12 V. What amount of current passes What amount of current passes through the headlight? through the headlight?

A: 0.5 AA: 0.5 A

Ohm’s LawOhm’s Law

► In a portable radio, 0.50 A of In a portable radio, 0.50 A of current are flowing through a current are flowing through a conductor that provides 18 conductor that provides 18 of of resistance. What potential difference is resistance. What potential difference is provided by the battery? provided by the battery?

A: 9VA: 9V

Series CircuitSeries Circuit

► In a series circuit, the current at one In a series circuit, the current at one location in the circuit is ________the location in the circuit is ________the current at another location in the current at another location in the circuit.circuit.

A: Equal toA: Equal to► If two different resistors are connected If two different resistors are connected

in series, the voltage across one resistor in series, the voltage across one resistor will be _________ the voltage across the will be _________ the voltage across the second resistor.second resistor.

A: Different fromA: Different from

Parallel CircuitsParallel Circuits

► If two different resistors are connected in If two different resistors are connected in parallel, the voltage across one resistor will parallel, the voltage across one resistor will be _________the voltage across the second be _________the voltage across the second resistor.resistor.

A: Equal toA: Equal to► Two different resistors are connected in Two different resistors are connected in

parallel. The current through one of the parallel. The current through one of the resistors will be __________ the current resistors will be __________ the current through the other resistor. through the other resistor.

A: Different fromA: Different from

Series and Parallel CircuitsSeries and Parallel Circuits

►Which bulbs are in parallel?Which bulbs are in parallel?

A: 3, 4, and 5A: 3, 4, and 5

► Calculate the missing quantities for the Calculate the missing quantities for the circuit below.circuit below.

A: V1 = 7.5V; R1 = 5 ohms; R2 = 3 ohmsA: V1 = 7.5V; R1 = 5 ohms; R2 = 3 ohms

Series CircuitSeries Circuit

Parallel CircuitParallel Circuit

►Calculate the missing quantities for the Calculate the missing quantities for the circuit below.circuit below.

A: V1 and V2 = 40 V and R1 = 2 A: V1 and V2 = 40 V and R1 = 2 ohmsohms

PowerPower

► A current of 5.0 A flows through a flashlight A current of 5.0 A flows through a flashlight bulb when it is connected to 6.0 V. What is bulb when it is connected to 6.0 V. What is the power of this bulb?the power of this bulb?

A: 30 wattsA: 30 watts► A 600 W electric heater is connected to a 120 A 600 W electric heater is connected to a 120

V source. What current flows through the V source. What current flows through the heater? heater?

A: 5 AA: 5 A► 2.5 A current flows through a 100 W lamp. 2.5 A current flows through a 100 W lamp.

What is the voltage across the lamp? What is the voltage across the lamp? A: 40 VA: 40 V

Cost of ElectricityCost of Electricity

► An electric heater draws 1300 W of power. An electric heater draws 1300 W of power. Electricity costs 10¢ per kWElectricity costs 10¢ per kWh. How much h. How much does it cost to operate the heater 5.0 h a does it cost to operate the heater 5.0 h a day for 30 days?day for 30 days?

A: $19.50A: $19.50► A dryer is used an average of 25.0 h a A dryer is used an average of 25.0 h a

month. The dryer draws 45.0 A of current month. The dryer draws 45.0 A of current from a 120 V outlet. If electricity costs 8¢ from a 120 V outlet. If electricity costs 8¢ per kWper kWh, how much will it cost to operate h, how much will it cost to operate the dryer for one year?the dryer for one year?

A: $129.60 A: $129.60