What are the colors of 300 ohm resistors

Didn't your teacher teach?
If it's a four-color ring, it's orange black brown gold
3 0 *10=300
If it's Wu sehuan, it's orange, black and gold
It should be

What is the color ring of 0 ohm resistor?
Four ring

The resistance of 0 Ω can be a single black ring, or four black rings, or five black rings, or bare paint. Its electrical meaning is to use it as jumper for line crossing, which is more common in some digital circuits and some power supply circuits
Analog circuits are not recommended or prohibited

What are the color rings of 2K ohm resistor? What are the colors?

Ring 4: red (2) black (0) red (10 ^ 2) gold (accuracy ± 5%) 20 * 10 ^ 2 = 2000

First question: a 47 kW three motor, voltage 380 V, power factor 0.85?
The second question: a 500 kV transformer, high voltage 10000 V, low voltage 380 V, how much is his high voltage and low voltage current?

1》 I = 47 / 1.732/0.38/0.85 = 84A. 2 "high pressure side: I = 500 / 1.732/10 = 28.87a, low pressure side: I = 500 / 1.732/0.38 = 759.69a

How much current air switch is needed for the power of 380V and 13kw? How to calculate?

13kw what equipment must have power factor to determine
If it is a 13kw heating tube, the working current is 20a, the air switch can be C25
If the motor is 13kw, the working current is 26a, and the air switch can select D32
If it is a 13kw high pressure mercury lamp, the working current is 40a, and the air switch can select C63

A group of electric heating tubes with working voltage of 380 V and three-phase current of 20 a respectively, how much power and power consumption per hour?

Pure resistance circuit P = root 3ui = 3x220x20 = 13200w = 13.2kw.. power consumption per hour is 13.2 degrees

What circuit voltage is 380V

It is the voltage between phases of commercial power. The phase to phase of three-phase power is 380V, and the phase to zero line is 220V. Generally, 380V is power, and 220V is lighting

What is the current for 380 V?
How much heat loss does a 1kW electric heating tube have?

You need to determine whether it's a single-phase or three-phase device. For single-phase: P = uicosa for three-phase: P = buicosa. B: it's 3 square root

It is measured that the voltage at both ends of an electric appliance is 6V, and the charge it passes through in five minutes is 300C. It is calculated by the resistance of the electric appliance and the current in five minutes

1、 Calculate the current through I = q / T:
I=Q/t=300C/300s=1A；
2、 From I = u / R, we can get r = u / I and calculate the resistance
R=U/I=6V/1A=6Ω；
3、 Work done by current calculated by w = uit:
W=UIt=6vx1Ax300s=1800J.

If the voltage at both ends of an electrical appliance in the circuit is 18V and the current passing through the electrical appliance is 0.6A, what is the resistance value of the electrical appliance
When the current is reduced to 0.3A, what is the voltage applied at both ends of the appliance? (detailed process, preferably with a diagram)

R = u / I = 18 / 0.6 = 30 Ω, when the current changes, the resistance does not change, and the voltage U = IR = 0.3x30 = 9V

What are the colors of 300 ohm resistors