A current of 1 A is maintained in a simple circuit with a total resistance of 2.5 Ω. How much heat is generated in 4.0 s?
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P = I²R = 1*2.5 = 2.5 watts
1 watt is a Joule per second, or a Joule is a watt-second
E = 2.5 J/s x 4.0s = 10 Joules
It says I need more numbers for the answer...
10 Joules is correct to 2 significant figures. Try 10. or 10.0
To calculate the heat generated in a circuit, we can use the formula:
Heat (Q) = Current (I) * Time (t) * Resistance (R)
In this case, the current (I) is given as 1 A, the resistance (R) is given as 2.5 Ω, and the time (t) is given as 4.0 s.
Substituting these values into the formula, we can calculate the heat generated:
Q = 1 A * 4.0 s * 2.5 Ω
First, we multiply 1 A by 4.0 s:
Q = 4.0 C * 2.5 Ω
Next, we multiply 4.0 C by 2.5 Ω:
Q = 10 J
Therefore, the heat generated in 4.0 s is 10 J (joules).