J J E E O O P P A A D D Y Y ! ! J J E E O O P P A A D D Y Y ! ! Welcome to … Skip Rules R R R R.

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You will choose You will choose questions from questions from the following the following

six topic areas:six topic areas:

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Units

What do you know about…What do you know about…What do you know about…What do you know about…


Circuits


Heating


Household/Misc.

UnitsUnits CircuitsCircuits HeatingHeating Household/Household/Misc.Misc.

1010 1010 1010 1010

2020 2020 2020 2020

3030 3030 3030 3030

4040 4040 4040 4040

5050 5050 5050 5050FINAL QUESTIONFINAL QUESTIONFINAL QUESTIONFINAL QUESTION

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1:101:101:101:10

What is the unit for current?

CLICK TO CHECKCLICK TO CHECK

Units f o r 1 0 p o i n t s …Units f o r 1 0 p o i n t s …Units f o r 1 0 p o i n t s …Units f o r 1 0 p o i n t s …

1:10 1:10 AnswerAnswer1:10 1:10 AnswerAnswer T h e c o r r e c t a n s w e r i s …T h e c o r r e c t a n s w e r i s …T h e c o r r e c t a n s w e r i s …T h e c o r r e c t a n s w e r i s …

Amperes or AmpsAmperes or Amps

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10

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1:201:201:201:20

What is the unit for energy?




JoulesJoules


20

1:301:301:301:30

What is the unit for Voltage?




Volts (of course)Volts (of course)


30

1:401:401:401:40

What is the unit for power?




WattWatt


40

1:501:501:501:50

What does the unit for power represent? And what therefore are the unit of power’s units?




Amount of energy per unit time, so it Amount of energy per unit time, so it is J/s.is J/s.


50

2:102:102:102:10

What is the definition of a circuit?


Circuits f o r 1 0 p o i n t s …Circuits f o r 1 0 p o i n t s …Circuits f o r 1 0 p o i n t s …Circuits f o r 1 0 p o i n t s …


A closed loop along which an A closed loop along which an electrical current flowselectrical current flows


10

2:202:202:202:20

What are the two types of circuits?




Series and parallelSeries and parallel


20

2:302:302:302:30

The diagram below shows two circuits,

what type is each one?





30

2:402:402:402:40

What is the formula for Ohm’s Law?




V = IRV = IR


40

2:502:502:502:50

Using Ohm’s Law, if a lightbulb in a house provides 5 Ohms of resistance, what current must be passing through it?




VV

I RI R

So I = V/R.So I = V/R.

In a house, V = 110 Volts, so In a house, V = 110 Volts, so I = 110/5 = 22 AmpsI = 110/5 = 22 Amps


50

3:103:103:103:10

What is specific heat?


Heating f o r 1 0 p o i n t s …Heating f o r 1 0 p o i n t s …Heating f o r 1 0 p o i n t s …Heating f o r 1 0 p o i n t s …


The amount of energy you The amount of energy you need to raise the temperature need to raise the temperature

of a substance.of a substance.


10

3:203:203:203:20

Which has a higher specific heat, water

or aluminum?




Water (it is harder to heat Water (it is harder to heat up)up)


20

3:303:303:303:30



What formula have we been What formula have we been using for calculating heat using for calculating heat

energy?energy?

What formula have we been What formula have we been using for calculating heat using for calculating heat

energy?energy?


HE = m*c*HE = m*c*ΔΔTT

HE = heat energy HE = heat energy m = mass of substance m = mass of substance c = specific heat c = specific heat ΔΔT = change in temperatureT = change in temperature


30

3:403:403:403:40

Two Heating are acting on a skydiver – a 700 N force downward due to gravity

and a 100 N force upwards due to air

resistance. What is her net force?




Her net force is 600 N downwards.Her net force is 600 N downwards.


40

3:503:503:503:50

A 100 kg skydiver is being accelerated 10 m/s2 downward due to gravity while air resistance is pushing up on her with 1000 N of force. What is the net force on her?




The net force on her is zero. The net force on her is zero.

From F = ma, she has 100 * 10 = 1000 From F = ma, she has 100 * 10 = 1000 N upwards which balances the N upwards which balances the

downward force.downward force.


50

4:104:104:104:10

Name three household appliances that use a lot of energy.


Household/Misc. f o r 1 0 p o i n t s …Household/Misc. f o r 1 0 p o i n t s …Household/Misc. f o r 1 0 p o i n t s …Household/Misc. f o r 1 0 p o i n t s …


There are of course a lot of correct There are of course a lot of correct answers. Here’s what I came up answers. Here’s what I came up with: Hot water heater, stove, air with: Hot water heater, stove, air conditioner, baseboard heater or conditioner, baseboard heater or

radiator, refrigeratorradiator, refrigerator


10

4:204:204:204:20

What is a Kilowatt-hour measuring?




Energy. A Watt is energy/time, so a Energy. A Watt is energy/time, so a watt-hour would be energy/time * watt-hour would be energy/time * time. We can cancel time and we time. We can cancel time and we

just have energy.just have energy.


20

4:304:304:304:30



In Boston, when would you In Boston, when would you expect to have the highest expect to have the highest

energy bills and why?energy bills and why?

In Boston, when would you In Boston, when would you expect to have the highest expect to have the highest

energy bills and why?energy bills and why?



30

January and February January and February (the coldest months). (the coldest months).

This is because it takes This is because it takes a lot of energy to heat a a lot of energy to heat a

house.house.

January and February January and February (the coldest months). (the coldest months).

This is because it takes This is because it takes a lot of energy to heat a a lot of energy to heat a

house.house.

4:404:404:404:40

What is the formula for power?




P = IVP = IV


40

4:504:504:504:50 Household/Misc. f o r 5 0 p o i n t s …Household/Misc. f o r 5 0 p o i n t s …Household/Misc. f o r 5 0 p o i n t s …Household/Misc. f o r 5 0 p o i n t s …


When heating up water in a stove, some heat

energy is lost and doesn’t go into heating the water. Where could

this lost energy go? (Need two correct

answers)

When heating up water in a stove, some heat

energy is lost and doesn’t go into heating the water. Where could

this lost energy go? (Need two correct

answers)


Two main losses are to the air and to Two main losses are to the air and to the pot. There is also energy lost to the pot. There is also energy lost to evaporation as the water heats up.evaporation as the water heats up.


50

Last Question Last Question Last Question Last Question

If we try to heat 1 kg of water 10 °C, with a 400 Watt water heater, how long will it take? The specific heat of water is about 4000 J/kg/ °C. Assume no heat is lost (100% efficiency).


T H E F I N A L Q U E S T I O NT H E F I N A L Q U E S T I O NT H E F I N A L Q U E S T I O NT H E F I N A L Q U E S T I O N

Last Last Answer Answer Last Last Answer Answer T h e c o r r e c t a n s w e r i s …T h e c o r r e c t a n s w e r i s …T h e c o r r e c t a n s w e r i s …T h e c o r r e c t a n s w e r i s …

The amount of energy input can be found from The amount of energy input can be found from HE = m*c*HE = m*c*ΔΔT = 1 * 4000 * T = 1 * 4000 *

10 = 40000 J.10 = 40000 J.

A Watt (power) is energy/time. We can A Watt (power) is energy/time. We can rearrange so time = energy/power.rearrange so time = energy/power.

We can plug in then: time = 40000/400 = We can plug in then: time = 40000/400 = 100 seconds – between one and two 100 seconds – between one and two

minutes.minutes.

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