Electronics

Question 1

whats the symbol for a transistor

Answer 1

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Question 2

whats the formula for solving resistor values

Answer 2

digit digit multiplier

Question 3

whats the formula for find total resistance in a series circuit

Answer 3

RT = R1 + R2

Question 4

What is ohms law

Answer 4

V = I X R

Question 5

Formula for calculation total resistance in parallel circuits

Answer 5

RT = R1 X R2 / R1 + R2 |or| 1/R1 + 1/R2 + 1/R3

Question 6

What is the formula to find the power in electrical Circuits

Answer 6

P = V X I |or| P = V^2/R |or| P = I^2 X R

Question 7

Whats the formula for voltage dividers

Answer 7

V1/R1= V2/R2 = Vs/RT

Question 8

What is a thermistor

Answer 8

A thermistor is a deceive whose resistance varies with temperature is is a temperature dependent resistor. it can either be when temperature increases resistance decreases or when temperature increases resistance increases.

Question 9

Whats is a LRD (light dependent resistor)

Answer 9

The LDR is a component whose resistance depends on the light falling on it. its resistances changes with light level. in bright light its resistance is low in darkness its resistance is high or it could be the other way around.

Question 10

what is a variable resistor

Answer 10

A variable resistor can be used in a circuit to control the current of a device. they are usually used in voltage dividers to adjust the sensitivity of the input.

Question 11

what is a transistor

Answer 11

its a switch that will turn on when an appropriate input signal is applied to the base an output current will then flow at the collector or emitter.

Question 12

what is the formula for current gain

Answer 12

Hfe = Ic/Ib

Question 13

What is a relay

Answer 13

relays are output switches from electric or electronic circuits. These output switches are used as inputs for other circuits.

Question 14

if an LDR is at the top of a circuit what happens

Answer 14

light level increases = resistance of LDR decreases and volatage over LDR decreases so the Vout increases

Question 15

if an LDR is at the bottom of a circuit what happens

Answer 15

light level decreases= resistance of LDR increases and volatage over LDR increases so the Vout increases

Question 16

if an Transistor is at the topof a circuit what happens

Answer 16

temperature increases = resistance of transistor decreases and volatage over transistor decreases so the Vout increases

Question 17

if a Transistor is at the bottom of a circuit what happens

Answer 17

temperature decreases = resistance of transistor increases and volatage over transistor increases so the Vout increases