Question

An operating electric heater draws a current of 10 amperes and has a resistance of 5 :. How much energy does the heater use in 100 seconds

Answer 1

The electric heater uses 5000 joules of energy in 100 seconds.

Step-by-step explanation:

To calculate the energy used by the electric heater, we can use the formula: energy (in joules) = power (in watts) x time (in seconds). Given that the heater has a power of 10 amperes and a resistance of 5 ohms,

we can use Ohm's law (V = I×R) to find the voltage across the heater, which is 50 volts. So, the power of the heater is 50 watts. Multiplying the power by the time of 100 seconds, we get:

energy = power x time = 50 watts x 100 seconds = 5000 joules

Therefore, the heater uses 5000 joules of energy in 100 seconds.

Answer 2

The energy the heater use in 100 seconds is 5000 J.

What is the energy?

Electrons, which are mobile electric charges, are the source of electrical energy. The electrical energy carried by the charges increases with their speed of motion. Electrical energy is a type of kinetic energy because the charges that generate it are in motion.

E = Pt = (power) × (time)

`P = I^(2) R`,

I = current

R= resistance of the heater.

The energy used by the heater in 100 seconds=

`E = (I^(2) R) * (time)`.

=
`10^(2) * 5 * 100 s`

= 5000 J.