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Battery practice questions

28 questions from the hybrid and electric vehicles practice test.

Battery practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

Connecting battery cells in series does what?

  1. Raises amp-hours; voltage stays the same
  2. Raises both voltage and amp-hours
  3. Lowers voltage and raises amp-hours
  4. Raises voltage; amp-hours stay the same
Show the answer

D. Raises voltage; amp-hours stay the same

Series cells add their voltages while the same current flows through each, so capacity in amp-hours is unchanged. Adding amp-hours takes parallel connection.

Reference: Series and parallel circuits

Connecting cells in parallel does what?

  1. Raises amp-hours; voltage stays the same
  2. Raises voltage; amp-hours stay the same
  3. Raises voltage and lowers amp-hours
  4. Lowers both the voltage and the amp-hours
Show the answer

A. Raises amp-hours; voltage stays the same

Parallel cells share the current, so capacity adds up while voltage stays at one cell's value. Voltage only rises when cells are placed in series.

Reference: Series and parallel circuits

State of charge (SOC) describes:

  1. How much capacity is left compared with a brand-new pack
  2. How fast the pack is being charged or discharged
  3. How much energy is stored now, as a percent of full
  4. How evenly the cells in the pack are balanced
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C. How much energy is stored now, as a percent of full

SOC is the fuel gauge: the present charge as a percentage of what the pack can currently hold. Capacity compared with new is state of health, a measure of ageing.

Reference: Battery management system operation

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