AC charging (Level 1 and Level 2) in EV Technology - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe Level 1 AC charging.

EV Technology

Level 1 AC charging uses a standard household outlet with a voltage of [1] volts.

Drag options to blanks, or click blank then click option'

A240

B12

C480

D120

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Level 1 with Level 2 voltage.

Thinking Level 1 uses 240 volts.

Level 1 AC charging uses a standard 120-volt household outlet, which is common in many homes.

2fill in blank

medium

Complete the sentence to describe the typical charging current for Level 2 AC charging.

EV Technology

Level 2 AC charging typically provides a current of up to [1] amps.

Drag options to blanks, or click blank then click option'

A30

B80

C12

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a current too low for Level 2.

Confusing amps with volts.

Level 2 AC charging usually provides up to 30 amps of current, allowing faster charging than Level 1.

3fill in blank

hard

Fix the error in the statement about Level 1 charging voltage.

EV Technology

Level 1 charging uses a voltage of [1] volts, which is higher than Level 2 charging.

Drag options to blanks, or click blank then click option'

A120

B240

C480

D12

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up Level 1 and Level 2 voltages.

Choosing a voltage higher than Level 2 for Level 1.

Level 1 charging uses 120 volts, which is lower than Level 2 charging voltage (usually 240 volts).

4fill in blank

hard

Fill both blanks to complete the description of Level 2 charging equipment.

EV Technology

Level 2 charging requires a [1] volt power supply and typically uses a [2] amp circuit breaker.

Drag options to blanks, or click blank then click option'

A240

B120

C40

D15

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing voltage and current values.

Choosing 120 volts for Level 2.

Level 2 charging uses a 240-volt power supply and usually requires a 40 amp circuit breaker for safety and performance.

5fill in blank

hard

Fill all three blanks to complete the statement about charging speed and connector types.

EV Technology

Level 1 charging uses a [1] plug, Level 2 charging uses a [2] plug, and Level 2 charging is generally [3] than Level 1.

Drag options to blanks, or click blank then click option'

ANEMA 5-15

BJ1772

Cfaster

Dslower

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up plug types.

Saying Level 1 is faster than Level 2.

Level 1 charging uses the NEMA 5-15 plug (standard household plug), Level 2 uses the J1772 plug, and Level 2 charging is faster than Level 1.

Practice

1. What is the main difference between Level 1 and Level 2 AC charging for electric vehicles?

easy

A. Level 1 uses DC power; Level 2 uses AC power

B. Level 1 requires special cables; Level 2 uses regular outlets

C. Level 1 is only for public stations; Level 2 is only for home use

D. Level 1 uses 120V and is slower; Level 2 uses 240V and is faster

Solution

1. Step 1: Understand voltage levels for charging

   Level 1 charging uses a standard 120V outlet, which provides slower charging speeds.

2. Step 2: Compare Level 2 charging voltage

   Level 2 charging uses a 240V outlet or station, allowing faster charging than Level 1.

3. Final Answer:

   Level 1 uses 120V and is slower; Level 2 uses 240V and is faster -> Option D

4. Quick Check:

   Voltage difference = charging speed difference [OK]

Hint: Remember: 120V slow, 240V fast charging [OK]

Common Mistakes:

• Confusing AC with DC charging
• Thinking Level 1 is faster
• Mixing outlet types

2. Which of the following is the correct description of a Level 1 AC charging setup?

easy

A. Requires a DC fast charger

B. Uses a 240V outlet and special charging station

C. Uses a standard 120V household outlet

D. Only available at public charging stations

Solution

1. Step 1: Identify Level 1 charging voltage

   Level 1 charging uses a standard 120V household outlet, which is common in homes.

2. Step 2: Eliminate incorrect options

   240V outlets and DC fast chargers are not part of Level 1; public-only availability is incorrect.

3. Final Answer:

   Uses a standard 120V household outlet -> Option C

4. Quick Check:

   Level 1 = 120V outlet [OK]

Hint: Level 1 = regular home outlet (120V) [OK]

Common Mistakes:

• Confusing Level 1 with Level 2 voltage
• Thinking Level 1 needs special stations
• Mixing AC with DC chargers

3. If an electric vehicle takes 12 hours to fully charge using Level 1 AC charging, approximately how long would it take using Level 2 AC charging assuming Level 2 charges 3 times faster?

medium

A. 4 hours

B. 36 hours

C. 12 hours

D. 6 hours

Solution

1. Step 1: Understand charging speed ratio

   Level 2 charges about 3 times faster than Level 1.

2. Step 2: Calculate charging time with Level 2

   Divide Level 1 time (12 hours) by 3: 12 / 3 = 4 hours.

3. Final Answer:

   4 hours -> Option A

4. Quick Check:

   12 hours ÷ 3 = 4 hours [OK]

Hint: Divide Level 1 time by 3 for Level 2 time [OK]

Common Mistakes:

• Multiplying instead of dividing
• Choosing same time for both levels
• Confusing faster with slower

4. A user tries to charge their EV using a Level 2 charger but notices the charging speed is very slow, similar to Level 1. What could be the likely cause?

medium

A. The EV is only compatible with DC fast charging

B. The charger is plugged into a 120V outlet instead of 240V

C. The charging cable is damaged and not working

D. The EV battery is already full

Solution

1. Step 1: Analyze charging voltage setup

   Level 2 charging requires a 240V outlet; using 120V will cause slow charging like Level 1.

2. Step 2: Evaluate other options

   Compatibility with DC fast charging or full battery wouldn't cause slow Level 2 charging; damaged cable might stop charging entirely.

3. Final Answer:

   The charger is plugged into a 120V outlet instead of 240V -> Option B

4. Quick Check:

   Wrong voltage = slow charging [OK]

Hint: Check if charger uses correct 240V outlet [OK]

Common Mistakes:

• Assuming battery is full without checking
• Confusing DC fast charging compatibility
• Ignoring outlet voltage differences

5. An EV owner wants to install a home charging station that charges their vehicle twice as fast as a Level 1 charger but does not want to upgrade to a full 240V Level 2 system. Which option best fits this requirement?

hard

A. Use a Level 1 charger with a higher amperage 120V outlet

B. Install a Level 2 charger with 240V outlet

C. Use a portable DC fast charger

D. Charge only at public stations

Solution

1. Step 1: Understand charging speed and voltage options

   Level 1 chargers use 120V but can vary amperage to increase speed somewhat, though not as fast as Level 2.

2. Step 2: Match requirement of twice speed without full 240V upgrade

   Using a higher amperage 120V outlet can roughly double charging speed without needing 240V installation.

3. Final Answer:

   Use a Level 1 charger with a higher amperage 120V outlet -> Option A

4. Quick Check:

   Higher amperage 120V = faster Level 1 charging [OK]

Hint: Higher amps on 120V can speed Level 1 charging [OK]

Common Mistakes:

• Thinking only 240V can increase speed
• Confusing DC fast chargers with AC chargers
• Ignoring home installation constraints