Could someone tell me if this is right?

The voltage across a 10-ohm resistor carrying 3 amps must be

E=I*R == E=3*10= 30 volts

You are right.

Thanks

To verify if the calculation is correct, let's use Ohm's Law.

Ohm's Law states that the voltage (E) across a resistor is equal to the current (I) flowing through it multiplied by the resistance (R) of the resistor.

In this case, the current (I) is given as 3 amps and the resistance (R) is given as 10 ohms.

So, using Ohm's Law, we can calculate the voltage (E):

E = I * R
E = 3 A * 10 Ω
E = 30 V

Therefore, the calculation is indeed correct. The voltage across the 10-ohm resistor carrying 3 amps is 30 volts.