1. គេឲ្យបរិមាណបន្ទុក អគ្គិសនី 1500C ឆ្លងកាត់ឆ្នាំងអ៊ុតមួយ។ គណនា រយៈពេលនៃការប្រើប្រាស់ ឆ្នាំងអ៊ុត បើគេដឹងថាអាំងតង់ស៊ីតេចរន្តឆ្លងកាត់ ឆ្នាំងអ៊ុត គឺ 1.5A ។
2. បាតេតីអាគុយមាកំណត់ចង្អុល 90Ah ។ តើអាគុយអាចផ្ទុកបរិមាណបន្ទុកអគ្គីសនីបានប៉ុន្មានគូឡុំ ( C ) ?
3. គណនាបរិមាណបន្ទុកអគ្គីសនី( គិតជាអំពែម៉ោង Ah) ដែលឆ្លងកាត់់ចង្កៀងអគ្គិសនីមួយរយៈពេល 1h30mn បើគេដឹងថាអាំងតង់សុីតេ ចរន្តឆ្លងកាត់ចង្កៀងគឺ 0.8A ។
Please tell me

To solve these problems, we will use the relationship between electric charge (\(Q\)), current (\(I\)), and time (\(t\)) given by the formula:

\[ 
Q = I \times t 
\]

Where:
- \(Q\) is the electric charge in coulombs (C),
- \(I\) is the current in amperes (A),
- \(t\) is the time in seconds (s).

Now let's go through each problem step-by-step:

### Problem 1

**Given:**
- Electric charge (\(Q\)) = 1500 C
- Current (\(I\)) = 1.5 A

**Find:**
- Time (\(t\))

Using the formula \(Q = I \times t\), we can rearrange it to solve for time:

\[ 
t = \frac{Q}{I} 
\]

Plugging in the values:

\[ 
t = \frac{1500 \, \text{C}}{1.5 \, \text{A}} = 1000 \, \text{s} 
\]

Thus, the time is 1000 seconds.

### Problem 2

**Given:**
- Battery capacity = 90 Ah

**Find:**
- Charge in coulombs (C)

1 Ampere-hour (Ah) is equal to 3600 coulombs because there are 3600 seconds in an hour. Therefore:

\[ 
Q = 90 \, \text{Ah} \times 3600 \, \text{C/Ah} = 324000 \, \text{C} 
\]

The battery can store 324,000 coulombs of electric charge.

### Problem 3

**Given:**
- Current (\(I\)) = 0.8 A
- Time = 1 hour 30 minutes = 1.5 hours

**Find:**
- Charge in ampere-hours (Ah)

Using the formula \(Q = I \times t\) and given time in hours:

\[ 
Q = 0.8 \, \text{A} \times 1.5 \, \text{h} = 1.2 \, \text{Ah} 
\]

Thus, the electric charge is 1.2 ampere-hours.

---

### Summary of Results
1. The time for the electric iron usage is 1000 seconds.
2. The battery can store 324,000 coulombs of electric charge.
3. The electric charge passing through the lamp is 1.2 ampere-hours.

Would you like further explanations or have any questions about these calculations?

### Related Questions

1. How do you convert ampere-hours to coulombs?
2. What is the physical meaning of electric charge in a circuit?
3. How does the current affect the energy consumption of an electric device?
4. What happens to the electric charge if the current is doubled for the same time period?
5. How can you determine the time a battery will last given its capacity and a device's current draw?
6. What is the significance of the ampere-hour rating on a battery?
7. How does the efficiency of a device affect its energy consumption?
8. How would you calculate the energy used by the iron if given its voltage and time?

### Tip

Remember that electric current is a flow of electric charge. The greater the current, the more charge is flowing per unit time.

Learn how to calculate electric charge and battery capacity with detailed step-by-step solutions. Solve problems involving electric iron usage time, battery storage capacity, and electric charge passing through a lamp. Suitable for high school students.

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