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An 8.0 Ω resistor is connected to 20 V.

a. Find I

b. Find how much energy is transformed in 12 minutes

a. I = e / r = 20 v / 8 Ω = 2.5 A

b. power = E I = 20 V * 2.5 A = 50 W

a Watt is a Joule per second ... 50 J/s * 12 min * 60 s/min = 36 kJ

Did you know?

Did you know that in an electrical circuit, the current (I) can be found by dividing the voltage (V) by the resistance (R)? For example, if an 8.0 Ω resistor is connected to a 20 V power source, the current can be determined by dividing 20 V by 8.0 Ω. This calculation can help us understand how much electricity is flowing through the circuit. In addition, did you know that the amount of energy transformed in an electrical circuit can be calculated by multiplying the power (P) by the time (t)? Power is given by the formula P = V x I, where V represents voltage and I represents current. For instance, if the power in the circuit is 160 W (calculated by multiplying 20 V by the calculated current), and the circuit operates for 12 minutes, the amount of energy transformed can be found by multiplying 160 W by 12 minutes. This knowledge allows us to quantify the amount of energy consumed or transferred in a specific time period.