Greater and smaller power Animation Play

Heat from the inside of the Earth Whiteboard exercise Play

Heat from the inside of the Earth Student activity Play

Heat from the Sun Simulation Play

Heat from the Sun Whiteboard exercise Play

Heat from the Sun Student activity Play

High-voltage transmission lines Illustration Play

High-voltage transmission lines Slideshow Play

High-voltage transmission lines Student activity Play

Higher voltage but lower current Student activity Play

Higher voltage but lower current Illustration Play

Higher voltage but lower current Whiteboard exercise Play

Household electrical wiring Simulation Play

How do we divide powers of 10? Whiteboard exercise Play

How do we multiply powers of 10? Animation Play

How many different divisors does a natural number have? A more difficult problem Student activity Play

How many divisors? Whiteboard exercise Play

How many divisors? Animation Play

How much can you save by using an energy-saving light bulb? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Whiteboard exercise Play

How much can you save by using an energy-saving light bulb? Student activity Play

How much does it cost to watch television? Whiteboard exercise Play

How much does it cost to watch television? Student activity Play

How to calculate the power of an electric current Simulation Play