Question

На реостате имеется табличка с надписью "3 А; 35 Ом". Можно ли этот реостат включить в цепь с напряжением 220 В

Answer 1

u= i R= 3*35=105 B < 220 B нельзя

Answer 2

U=I*R

U=3A*35Ом=105В(Больше этой границы реостат ломается! )

Нельзя! т.к. 220В>105В

Answer 3

Can the Rheostat be Connected to a 220V Circuit?

The rheostat is labeled "3 A; 35 Ohm." This indicates that the rheostat has a resistance of 35 ohms and can handle a current of up to 3 amperes. To determine if this rheostat can be safely connected to a 220V circuit, we can use Ohm's law, which states that voltage (V) equals current (I) multiplied by resistance (R), or V = I * R.

Using this formula, we can calculate the current that would flow through the rheostat when connected to a 220V circuit:

Current (I) = Voltage (V) / Resistance (R)

Current (I) = 220V / 35Ω = 6.29A

Given that the calculated current is 6.29A, which exceeds the rheostat's maximum current rating of 3A, it is not safe to connect this rheostat directly to a 220V circuit. The rheostat would likely be damaged due to the excessive current flow.

Therefore, based on the provided information, it is not advisable to connect this rheostat directly to a 220V circuit.