Electricity is generated by the movement of charged particles, in which opposite charges ___________ one another and like charges _________ one another.a) repel, repel b) repel, attractc) attract, repeld)repel, repel

Electricity is generated by the movement of charged particles, in which opposite charges ___________ one another and like charges _________ one another.a) repel, repel b) repel, attractc) attract, repeld)repel, repel

Electric charge is measured in ________________Electric current is measured in _______________Electric resistance is measured in _____________Electric potential difference is measured in ________.Electric power is measured in ________________

Electric charge is measured in CoulombsElectric current is measured in amperesElectric resistance is measured in ohms (Ω)Electric potential difference is measured in volts.Electric power is measured in watts

What is Ohm’s Law?Provide1. The a mathematical equation in words,

_________________________________2. The a mathematical equation in one letter symbols,

_________________________________3. And the mathematical equation in units. _________________________________

What is Ohm’s Law?Provide1. The a mathematical equation in words,

Volts = Current X Resistance2. The a mathematical equation in one letter symbols,

V= IR3. And the mathematical equation in units.

volts = amperes X ohms

How is electric power calculated?Provide1. The a mathematical equation in words,

_________________________________2. The a mathematical equation in one letter symbols,

_________________________________3. And the mathematical equation in units. _________________________________

How is electric power calculated?Provide1. The a mathematical equation in words,

Power = Current X Voltage2. The a mathematical equation in one letter symbols,

P= IV3. And the mathematical equation in units.

watts = amperes X volts

In a battery-powered circuit, because they have a _______ charge, electrons flow from the ______ to the ______.a) negative; anode; cathodeb) negative; cathode; anode c) positive; anode; cathoded) positive; cathode ; anode

In a battery-powered circuit, because they have a _______ charge, electrons flow from the ______ to the ______.a) negative; anode; cathodeb) negative; cathode; anode c) positive; anode; cathoded) positive; cathode ; anode

A circuit in which the path is complete, with no gaps is called a(n) _________________ because the _________ can flow.a)open circuit, currentb)open wire, resistancec)closed circuit, currentd)closed system, resistance

A circuit in which the path is complete, with no gaps is called a(n) _________________ because the _________ can flow.a)open circuit, currentb)open wire, resistancec)closed circuit, currentd)closed system, resistance

In a given circuit, increasing the length of the wire has which effect?a)Increases resistanceb)Decreases resistancec)Increases currentd)Has no affect on resistance or current

e)B and C

In a given circuit, increasing the length of the wire has which effect?a)Increases resistanceb)Decreases resistancec)Increases currentd)Has no affect on resistance or current

e)B and C

Making the wire longer increases resistance, and therefore decreases current (OHM’S LAW!!!), thereby also decreasing the power (since P=IV!!!)

How much power is used by a 9-V battery that produces a 3 amp current?   

How much power is used by a 9-V battery that produces a 3 amp current?   

Remember, P= IV ; or watts = amperes X volts.

Thus, in this case, watts = 3 amperes X 9 Volts = 27 watts

A circuit in which the path has gaps is called a(n) _________________ and the current __________ flow.a)open wire, canb)open circuit, cannotc)closed circuit, cand)closed system, cannot

A circuit in which the path has gaps is called a(n) _________________ and the current __________ flow.a)open wire, canb)open circuit, cannotc)closed circuit, cand)closed system, cannot

You have two light bulbs, one with a rating of 50 watts and one with a rating of 100 watts. Remember that the voltage across each would be the same if they were placed in a light socket. How would the current through each light bulb compare?a)Both bulbs would draw the same current.b)The higher watt bulb would draw less current.c)The lower watt bulb would draw less current.d)The lower watt bulb would draw more current.

You have two light bulbs, one with a rating of 50 watts and one with a rating of 100 watts. Remember that the voltage across each would be the same if they were placed in a light socket. How would the current through each light bulb compare?a) Both bulbs would draw the same current.b) The higher watt bulb would draw more current.c) The higher watt bulb would draw less current. d) The lower watt bulb would draw more current.

A higher watt bulb is drawing more power (remember watts is a measure of power..). And the power equation tells us that P = IV, which means that at a given voltage more power requires more current.

How much power is used when a 3 V battery produces 0.1 amp of current?   

How much power is used when a 3 V battery produces 0.1 amp of current?   

Remember, P= IV ; or watts = amperes X volts.

Thus, in this case, watts = 0.1 amperes X 3 volts, = 0.3 watts

Current is measured in _____, resistance in measured in _____ and power is measured in _____.a)watts, ohms, amperesb)amperes, ohms, wattsc)Coulombs, volts, amperesd)ohms, amperes, wattse)amperes, ohms, Coulombs

Current is measured in _____, resistance in measured in _____ and power is measured in _____.a)watts, ohms, amperesb)amperes, ohms, wattsc)Coulombs, volts, amperesd)ohms, amperes, wattse)amperes, ohms, Coulombs

In a given circuit, increasing the diameter of the wire (making it wider…) has which effect?a) Increases resistanceb)Decreases resistancec)Increases currentd)Has no affect on resistance or currente)B and C

In a given circuit, increasing the diameter of the wire (making it wider…) has which effect?a) Increases resistanceb)Decreases resistancec)Increases currentd)Has no affect on resistance or currente)B and CMaking the wire wider decreases the resistance, and therefore increases the current (OHM’S LAW!!!), thereby also increasing the power (since P=IV!!!)

What is the resistance of a device if the current through it is 10 amps and the voltage across it is 5 volts?   

What is the resistance of a device if the current through it is 10 amps and the voltage across it is 5 volts?   

Remember, V= IR ; or volts = amperes X ohmsTherefore, R = V ; or ohms = volts . I amperes Thus, in this case, ohms = 5 volts = 0.5 ohms

10 amperes

Label the circuit below to show the following: anode, battery, cathode, direction of electron flow, resistor, and switch.

LED light (0.40 Amp, 2.6 Volts)

Label the circuit below to show the following: anode, battery, cathode, direction of electron flow, resistor, and switch.

LED light (0.40 Amp, 2.6 Volts)

Battery

Anode Cathode

Electron flow

Switch Resistor

Electron flow

What power is used if a resistance of 100 ohms has a current of 0.1 amps flowing through it?

  

What power is used if a resistance of 100 ohms has a current of 0.1 amps flowing through it?

Remember, P= IV ; or watts = amperes X voltsHere we must first determine the volts before we can solve for watts.

From Ohm’s Law, we know that V= IR ; or volts = amperes X ohmsThus, in this case, volts = 0.1 amps X 100 ohms = 10 volts.

Substituting this value in our power equation above gives: watts = 0.1 amperes X 10 volts = 1 watt

  

What is the power used in a device if the resistance is 100 ohms and the voltage across it is 4V?

What is the power used in a device if the resistance is 100 ohms and the voltage across it is 4V?

Remember, P= IV ; or watts = amperes X voltsHere we must first determine the amperes before we can solve for watts.

From Ohm’s Law, we know that V= IR ; or volts = amperes X ohms.Rearranging this equation gives: amperes = volts ohms Thus, in this case, amperes = 4 volts = .04 amperes 100 ohms

Substituting this value in our power equation above gives: watts = 0.04 amperes X 4 volts = .16 watts