Điện trở của đây dẫn phụ thuộc vào chiều dài là tiết điện như thế nào?

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

explanation:

wheres the pic

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