Helpmyphysics

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Hi Physics lovers. Click the above picture to download the Java simulation of the photoelectric effect.

Click below below to get the experimental sheet.
Photoelectric practical.

Click the picture below to print off a summary of the photoelectric effect.

During the last few days before the Christmas holidays my students set about thinking about what a scientist would love to receive as a Christmas present.

There were some fantastic ideas.

The winner was Beth Gribben with her smashing science tie idea.
Congratulations Beth!

Runner ups were Kyle and Lewis.

Try out this simulation exploring out the relationship between the peak voltage of an a.c. source and the d.c. equivalent voltage.

Roll the mouse over the instructions and the think physics button for more information.

The Wheatstone Bridge is used to find the value of an unknown resistor.

When there is no p.d. across the bridge the we say the Wheatstone Bridge is balanced.

If the value of resistance in the decade box is changed then it follows there is a direct proportional change in the current that will flow across the bridge.

Provided the resistance is not changed too much away from the balance point then it can be written

Further info about the Wheatstone Bridge
BBC Bitesize Higher Physics: Wheatstone Bridge.

Click on the picture above to see a clearer image of the constellation Gemini with the king planet Jupiter.
This picture was taken on Friday 13th December 2013 around 2300 hours using my small Panasonic Digital camera set to night sky mode.

Now compare this star chart from the fabulous Heavens Above site

Gemini Star Chart

Here is a quiz for you to try on the topic of radiation.
The answers to the quiz will appear shortly.
Best of luck!

In the simulation below it can be seen that when electric current is taken from an electric cell the potential difference between the terminals decreases.

When no current is taken the tpd is at its maximum. This is the EMF of the electric cell.

The EMF of an electric cell is the maximum energy given to each Coulomb of electric charge.

This lost energy per coulomb, usually called "lost volts" is lost in the internal resistance of the electric cell.

You can download a poster for your notebook below.

InternalResistance