3 years ago

An electric heater is rated 1000w, 250v. calculate the resistance

Physics

1 answer:

frez [133]3 years ago

4 0

Answer:

Correct answer: R = 62.5Ω

Explanation:

Power P = U · I = U · U/R = U²/R => P = U²/R => R= U²/P

R = 250²/1000 = 62.5Ω

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Calculate the linear acceleration of a car, the 0.220-m radius tires of which have an angular acceleration of 13.0 rad/s2. Assum

Anuta_ua [19.1K]

Answer:

The linear acceleration of the car is 2.86m/s².

Explanation:

First of all, we have that the linear acceleration of the car and the tires is the same, because it moves ahead without disassembling itself. So, we only have to calculate the linear acceleration of the tires.

Next, it is known that the linear and angular acceleration are related by the formula:

$a=\alpha R$

Finally, we plug in the given values in order to calculate the acceleration:

$a=(13.0rad/s^{2})(0.220m)=2.86m/s^{2}$

It means that the linear acceleration of the car is 2.86m/s².

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3 years ago

a current of 5 ampere is passed for 2 hours in an electric iron having a resistance of 100 ohms calculate the heat produced

Alina [70]

Answer:

$\boxed{\sf Heat \ produced \ (H) = 5 \ kWh}$

Given:

Resistance (R) = 100 Ω

Current (I) = 5 A

Time (t) = 2 hours

To Find:

Heat developed (H) in the electric iron

Explanation:

Formula:

$\boxed{ \bold{ \sf H = I^2Rt}}$

Substituting values of I, R & t in the equation:

$\sf \implies H = {5}^{2} \times 100 \times 2 \\ \\ \sf \implies H = 25 \times 100 \times 2 \\ \\ \sf \implies H = 5000 \\ \\ \sf \implies H = 5 \: kWh$