Energy Review

• The unit for kinetic energy.• Joule

• The quantity represented by the kilowatt hour.Answer: Electric energy

• The unit for charge.• Answer:Coulomb

• The equation for power• Answer: P=IV

• In the equation for Ohm’s Law, represented by the “I”

• Answer: Current

• The equation to solve for current which includes charge and time.

• Answer: I = q/t

• The equation for Ohm’s Law• Answer: V=IR

• The rate at which energy is consumed• Answer: Power

• The definition of electric current. • Answer: flow of electric charge

• The relationship between current and resistance.

• Answer: direct

• The quantity that slows down current in a circuit

• Answer:resistance

• The unit for power.• Answer: watt

• The quantity that expresses the amount of energy in a charge

• Answer: voltage

• The flow of positive charges in a circuit• Answer: conventional current

• The current through the starter motor of a car is 120 A. If the battery maintains 10 V across the motor, how much electric energy is delivered to the starter in 10 s? (Hint: calculate power first)

• Answer: Find power• P=IV=120 A(10V)=1200 W• Find Energy E=Pt E=1200 W(10s)=12,000J

• In the equation for Coulomb’s Law, represented by the letter “q”

• Answer: charge

• The type of relationship shown between current and voltage

• Answer:direct

• The type of circuit in which one pathway exists• Answer:series

• The quantity that represents potential difference.

• Answer:voltage

• A flashlight bulb is rated at 9.0 W. If the light bulb drops 3.0 V, how much current goes through it?

• Answer: P=IV9.0W = I(3.0V)I=3 A

• A drawing of a circuit using symbols• Answer: schematic

• The outcome of adding resistors in a circuit when voltage does not change.

• Answer: decrease in current

• The letter that represents resistance in Ohm’s Law.

• Answer: R

• The symbol that represents a battery in a circuit

Answer:

• The type of circuit in which total resistance is greater than a single resistor

• Answer: series

• The total voltage drop across each resistor in a parallel circuit is ____ the total voltage in the circuit.

• Answer: equal to

• The unit for resistance.• Answer: ohms

• The current through a light bulb connected across the terminals of a 125 V outlet is 0.5 A. How much power is supplied to the bulb?

• Answer: » P=IV» P=(0.5A)(125V)» P=62.5 W

• The connection required for a voltmeter. • Answer: Parallel

• A lamp uses 6.0 V and 12 W when it is operating. What is the current through the lamp?

• Answer: P=IV12W=I(6.0V)I=2A

• A 15 ohm and a 5 ohm resistor are connected in series. What is the equivalent resistance?

• Answer: 20 ohms

• The behavior of current in a parallel circuit. • Answer: Adds up to total

• A device for measuring current. • Answer: ammeter

• Draw a parallel circuit with three lamps in parallel, and a battery.

• Three types of energy which electric energy can be converted to

• Answer: sound, light, heat

• A device for measuring voltage. • Answer: voltmeter

• Type of circuit in which current is the same through each branch.

• Answer: series

• The type of connection used for an ammeter• Answer: series

• An outlet that prevents injuries that are caused when an electric appliance falls into water. It contains an electric circuit that detects an extra current path and opens the circuit.

• Answer: ground fault interrupter

• The symbol for a resistor in a circuit.• Answer: Ώ

• An automatic switch that opens when the current reaches a value greater than the rated value in the circuit.

• Answer: circuit breaker

• A mobile source of electric power• Answer: battery

• The man who created the first battery to produce a lasting current

• Answer: Volta

• Type of circuit in which voltage is the same through each branch.

• Answer: parallel

• The current that passes through a 6 ohm resistor and uses 12 V.

• Answer: V=IR» 12V=I (6.0 ohms)» I=2A

• Draw a series circuit with one lamp, battery and ammeter.

• The purpose of a resistor in a circuit.• Answer: decrease current

• The flow of electric charge• Answer: current

• One way in which current can be increased in a circuit.

• Answer: increase voltage or decrease resistance