A traction battery supplies 50 A at 300 V. How much power is that, in kilowatts?
Answer in kW.
Show the answer
15 kW
P = V x I = 300 V x 50 A = 15,000 W. Divide by 1,000: 15 kW.
Reference: Watt's law
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Math practice questions
32 questions from the hybrid and electric vehicles practice test.
Math practice test
10 questions, graded as you go, with the reason for every answer. No sign-up.
What this covers
- Ohm's law
- Power
- Pack voltage
- Energy
- Efficiency
- Parallel circuits
- Charge time
- DC-DC converter
- Isolation resistance
- C-rate
- Range
- Circuit sizing
- Charging power
- Charging energy
Sample questions
A motor draws 60 kW from a 400 V battery. What is the battery current?
Answer in A.
Show the answer
150 A
I = P / V = 60,000 W / 400 V = 150 A.
Reference: Watt's law
A lithium-ion pack has 96 cells in series, each 3.7 V nominal. What is the nominal pack voltage?
Answer in V.
Show the answer
355.2 V
Series voltages add: 96 x 3.7 V = 355.2 V.
Reference: Series circuits; battery pack construction