ELECTRONICS Input Devices

Question 0

What is a microphone and give energy transformations

Answer 0

Amplifies sound. Sound to electrical.

Question 1

Give examples of input devices

Answer 1

Microphone, thermocouple, solar cell

Question 2

What is a thermocouple and give energy transformations

Answer 2

Heat to elecrical

Question 3

What is a solar celland give energy transformations

Answer 3

Light to electoral

Question 4

What is a thermistor?

Answer 4

Changes resistance depending on input factors (is also an input device)

Question 5

What happens to resist ace depending on temperature using a thermistor?

Answer 5

Temperature Up Resistance Down

Question 6

What is an LDR?

Answer 6

An input device which varies resistance depending on input factors.

Question 7

What happens to resistance depending on light with a LDR.

Answer 7

Light Up Resistance Down

Question 8

What is a capacitor?

Answer 8

Pa device which can sites electric charge

Question 9

What are the units of capacitance?

Answer 9

Farads

Question 10

What is the voltage of a fully charged capacitor?

Answer 10

Equal to the supply voltage

Question 11

What suitable input device is always used in a time delay circuit?

Answer 11

Capacitor and resistor

Question 12

What is a potentiometer?

Answer 12

An input device that can change resistance (sliding) moved up resistance increases across bottom letter and decreases with too.

Question 13

What is a voltage devider?

Answer 13

Two devises (usually resistors) connected in series. The voltage is divided up into two smaller voltages.

Question 14

Equations to remember with voltage devider a

Answer 14

V1. =. R1. V1= R1. x Vs
—— ——– ———–
V2. R2. R1 + R2.

And Vs= V1+ V2

Question 15

For this circuit the resistance of the LDR decreases as more light falls so voltage across LDR (v1) _______ and the voltage across the resistor (v2) _______even though resistance stays the same.

Answer 15

For this circuit the resistance of the LDR decreases as mor slight falls so voltage across LDR (v1) decreases and the voltage across the resistor (v2) increases even though resistance stays the same.

Question 16

Why are capacitors connected in series with a resistor?

Answer 16

Allows time for capacitor to charge up to supply voltage so time can be controlled.

Question 17

What are rules with voltage dividers?

Answer 17

As resistance decreases across one component, so will its voltage so voltage of other component will increase.

Question 18

How would a capacitor be discharged?

Answer 18

By closing the switch.

Question 19

How would you increase time for capacitor to charge?

Answer 19

Increase resistance of resistor or increase value of capacitor.

Question 40

GO LOOK AT SHEETS ON VOLTAGE DIVIDERS

Answer 40

GO NOOOOOOOOOW