Electricity revision. What is the question? Here are some answers what might the question be? Bistable latch thermistor NOT gate Diode-bridge direct current.

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Presentation transcript:

Electricity revision

What is the question? Here are some answers what might the question be? Bistable latch thermistor NOT gate Diode-bridge direct current

P6 Content Resistors Potential dividers Motors Generators Transformers Capacitors Logic gates

Logic gates: key facts High or 1 usually 5V Low or 0 usually 0V NOT AND OR NAND NOR

Truth tables AND Gate Input 1Input output ? ? ? ? Input 1Input output ? ? ? ? OR Gate NOT gate InputOutput 10 01

Truth tables NAND Gate Input 1Input output ? ? ? ? Input 1Input output ? ? ? ? NOR Gate

Logic gates

Fan needs a large current, logic gates only supply a low current

The most complicated diagram you could be asked Thermister On/off Switch LDR Light a bulb when it is HOT and DARK and a swtich is turned on Hot = 1 Cold = 0 Light = 1 On = 1 Dark = 0 off = 0 First step? Second step? Last step?

The Bistable or Latch gate You are only ever expected to say how it works like this: 1. When SET becomes on the output switches ON…….. SET RESET output 2. Even if SET becomes off the output stays ON 3. If the RESET becomes on the output becomes OFF

more logic gate questions.rtf

Transformers Transformers are used to _____ __ or step down _______. They only work on AC because an ________ current in the primary coil causes a constantly alternating _______ ______. This will “_____” an alternating current in the secondary coil. Words – alternating, magnetic field, induce, step up, voltage

Transformers Transformers are used to step up or step down voltage. They only work on AC because an alternating current in the primary coil causes a constantly alternating magnetic field. This will “induce” an alternating current in the secondary coil. Words – alternating, magnetic field, induce, step up, voltage

Transformer equation This helps explain why power is transmitted at high voltage You will need to know this one!

P6 so far quiz.ppt