Question

An electric heater is operated by applying a potential difference of 78.0 V across a nichrome wire of total resistance 7.00 Ω. a) Find the current in the wire. Answer in units of A.
b) Find the power rating of the heater. Answer in units of W.

Answer 1

PART A)

Here we know that

potential difference across the wire is

$V = 78 volts$

resistance of wire is

$R = 7 ohm$

now by ohm's law

$V = iR$

$78 = i(7 ohm)$

$i = 11.14 A$

Part b)

Power rating is defined as rate of electrical energy

it is defined as

$P = iV$

now we have

$P = 11.14 ( 78)$

$P = 869.1 Watt$

Answer 2

An electric heater is operated with a voltage of 78.0 V across a wire of resistance 7.00 Ω. The current is 11.1 A and the power rating is 866 W.

What is an electric current?

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

An electric heater is operated by applying a potential difference of 78.0 V across a nichrome wire of total resistance 7.00 Ω.

We can calculate the current using Ohm's law.

I = V / R = 78.0 V / 7.00 Ω = 11.1 A

where,

• I is the current.
• V is the voltage.
• R is the resistance.

What is the power rating?

The power rating of equipment is the highest power input allowed to flow through particular equipment.

We can calculate the power rating (P) using the following expression.

P = I × V = 11.1 A × 78.0 V = 866 W

An electric heater is operated with a voltage of 78.0 V across a wire of resistance 7.00 Ω. The current is 11.1 A and the power rating is 866 W.

Learn more about Ohm's law here: https://brainly.com/question/14296509