Flashcards
Even More Logical
Cards in this deck (9)
- 1What can a truth table be made with more of?It can be made for a logic system with three (or more) inputs, in order to work out what the final output is for any combination of inputs.
- 2What can the output from a logic gate switch on? What does this mean?A light emitting diode (LED). This means that when the logic gate gives a positive (high) output, the LED lights up.
- 3When does an LED emit light, and what does this mean?It emits light when a voltage is fed to it. This means it can be used to indicate the output of a logic gate.
- 4What does an LED require in series with it in a circuit and why?An LED requires only a very small current, so a resistor is put in series with the LED to ensure that the current through it is small enough.
- 5A relay can be used as a switch. What does the relay do?A small current in the relay coil switches on a circuit in which a larger current flows.
- 6Why is a relay needed for a logic gate?To switch on a larger current in a mains circuit because it works at the same low voltage as logic gates and keeps the low voltage circuit separate from the high voltage mains circuit.
- 7How should you fill in a truth table?By counting up in binary code, to make it easier.
E.g. A, B and C inputs - 000, 001, 010, 011, 100, 101, 110,111. - 8What can we use to get a high or low input for a logic gate?Switches, LDRs and thermistors as input sensors.
- 9What can putting an LDR or thermistor in series with a variable resistor in a potential divider make an input of what, for a logic gate?It can make an input for the logic gate that switches to high at exactly the right level or temp.
It makes the circuit completely adjustable.
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- GCSE Physics (P6) Flashcards on Even More Logical, created by Rebecca Smith on 10/06/2017.
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- Rebecca Smith
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