What you will practice
- Calculate current using I = V ÷ R.
- Calculate ideal steady-DC dissipation using P = V × I.
- Explain the limits of an ideal model and the difference between awareness and work qualification.
One ideal resistor
In this model, a stated voltage is applied across one ideal resistor. Divide volts by ohms to obtain amperes. Multiply by 1,000 for milliamperes. Multiply volts by amperes for watts. These results describe the specified ideal model, rather than a complete vehicle circuit.
Compare two loads
At 12 V and 1,000 Ω, the model gives 0.012 A, or 12 mA, and 0.144 W. Doubling resistance to 2,000 Ω at the same voltage gives 6 mA and 0.072 W. State the inputs, units and assumptions beside the answer.
A calculation has a boundary
Real circuits can include transients, changing loads, contact resistance, stored energy, temperature effects and supply limits. A nominal voltage or a calculated wattage does not establish that a physical component, harness or work procedure is suitable. ASE distinguishes xEV awareness from the trained technician role. This independent exercise awards neither qualification nor employer authorization.
References: ASE.
Worked case
A number is not a component approval
The virtual bench reports 0.144 W at 12 V and 1,000 Ω. Before anyone uses a physical component, its actual ratings, tolerance, environment, supply behavior and engineering requirements would need assessment. The exercise provides no wiring, high-voltage isolation or battery-opening procedure.
Open the virtual circuit benchReview your reasoning
Practice self-check
Read each explanation after checking your answers. A score records this exercise only; it does not establish a professional qualification or permission to perform a task.