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Heating Effect of an Electric Current

question 1 of 2 Grade: Twelve - G12
question 1 of 2 Grade: Twelve - G12

Q: A 2kW heater (240V) runs for 180 minutes. If electricity costs K5.00 per kWh, what is the cost?

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Did You Know?

Solve the system: From first equation: \(y = 2x - 3\). Substitute into second: \(x + 2(2x - 3) = 4\) ⇒ \(x + 4x - 6 = 4\) ⇒ \(5x = 10\) ⇒ x = 2. Then y = 2(2) - 3 = 1. So intersection point is (2, 1).

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Did You Know?

Solve the system: From first equation: \(y = 2x - 3\). Substitute into second: \(x + 2(2x - 3) = 4\) ⇒ \(x + 4x - 6 = 4\) ⇒ \(5x = 10\) ⇒ x = 2. Then y = 2(2) - 3 = 1. So intersection point is (2, 1).

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