Objective 4.2 to 4.5

Plenary Questions 4.2 to 4.5

10 June 2011

16:12

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Plenary Questions 42 to 45.one Download this file

Objective 4.4

version 1

Efficiency= useful E out/ Total E in

Useful Eout= Useful energy out (J)
Total Ein= Total energy in (J)
Efficiency= Efficiency (%)

version 2


Efficiency= Useful E out/ Total E in

Useful Eout= Useful energy out (J)
Useful Ein= Useful energy in (j)
Efficiency= Efficiency (no units; a number between 0 and 1)

Objective 4.3

understand that energy is conserved
-amount of energy is the same at the start and the end.

eg. 500J (start) ----> 500J (end)

Objective 4.2: energy input; energy output worksheet

forms of energy-

thermal (heat)

light

electrical

sound

kinetic

chemical

nuclear

potential (elastic and gravitational)

Unit 4: Keywords.

Scientific Facts I need to remember to improve (End Of Year Exam)

-acceleration= v-u/t (v=final velocity, u=initial velocity, t=time0

-changing from km/hr to m/s  

• km to metres= x1000
• hr to minutes= x60
• minutes to seconds= x60

-if there is an earth wire in an appliance then it is safe to use.

-resistance is measured in ohms

-electromagnetic spectrum are all transverse waves and they travel at the speed of light.

- equation relating critical angle and refractive index is

• sinC=1/n