AC charging (Level 1 and Level 2) in EV Technology - Mini Project: Build & Apply

Understanding AC Charging: Level 1 and Level 2

📖 Scenario: You are learning about electric vehicle (EV) charging at home. There are two common types of AC charging: Level 1 and Level 2. Each has different power levels and charging speeds.Imagine you want to organize information about these charging levels to understand their differences clearly.

🎯 Goal: Create a simple data structure that holds information about Level 1 and Level 2 AC charging. Then, add a configuration to compare their power ratings. Finally, write the main logic to identify which charging level is faster and complete the information display.

📋 What You'll Learn

Create a dictionary named ac_charging with keys 'Level 1' and 'Level 2' and their power ratings in kilowatts (kW).

Add a variable named power_threshold set to 7.0 kW to compare charging levels.

Write a loop using level and power to check which charging levels have power above the threshold.

Add a final key 'Fastest' to the dictionary with the charging level that has the highest power.

💡 Why This Matters

🌍 Real World

Understanding AC charging levels helps EV owners choose the right home charger and manage charging times effectively.

💼 Career

Knowledge of EV charging technology is useful for roles in automotive sales, EV infrastructure planning, and energy management.

1

Create the AC charging data dictionary

Create a dictionary called ac_charging with these exact entries: 'Level 1': 1.9 and 'Level 2': 7.2 representing power in kilowatts.

EV Technology

# Create the ac_charging dictionary with Level 1 and Level 2 power ratings
# Your code here

Hint

Use curly braces {} to create a dictionary with keys and values separated by colons.

2

Add a power threshold variable

Add a variable called power_threshold and set it to 7.0 to use as a comparison value for charging power.

EV Technology

ac_charging = {'Level 1': 1.9, 'Level 2': 7.2}
# Add power_threshold variable below
# Your code here

Hint

Just assign the number 7.0 to the variable power_threshold.

3

Identify charging levels above the threshold

Use a for loop with variables level and power to iterate over ac_charging.items(). Inside the loop, check if power is greater than power_threshold.

EV Technology

ac_charging = {'Level 1': 1.9, 'Level 2': 7.2}
power_threshold = 7.0
# Loop through ac_charging to find levels above power_threshold
# Your code here

Hint

Use for level, power in ac_charging.items(): to loop through the dictionary.

4

Add the fastest charging level to the dictionary

Add a new key 'Fastest' to the ac_charging dictionary. Set its value to the key with the highest power rating using max(ac_charging, key=ac_charging.get).

EV Technology

ac_charging = {'Level 1': 1.9, 'Level 2': 7.2}
power_threshold = 7.0
for level, power in ac_charging.items():
    if power > power_threshold:
        pass  # Add the fastest charging level below
# Your code here

Hint

Use the max() function with key=ac_charging.get to find the key with the highest value.

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