An electric iron of resistance `20 Omega` takes a current of `5 A`. Calculate the heat developed in `30 s`.

Explanation

To solve the problem of calculating the heat developed by an electric iron with a resistance of 20 ohms that takes a current of 5 A over a period of 30 seconds, we can follow these steps:

### Step 1: Identify the given values
- Resistance (R) = 20 Ω (ohms)
- Current (I) = 5 A (amperes)
- Time (T) = 30 s (seconds)

### Step 2: Use the formula for heat developed
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