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3 years ago

Why are fuse wires not provided in an electric circute containing an electric cell

Physics

1 answer:

Basile [38]3 years ago

3 0

Hey there,

Electric cells we use usually carry limited voltage. Here's an example: 1.5V. Really, there is no chance of any shot circuit. that's why MCB and fuse wires are not used in their circuit .

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A simple circuit has a 12.0V12.0V battery and three resistors of 6.0Ω6.0Ω connected in parallel. If the current through the batt

Umnica [9.8K]

Answer:

The internal resistance of the battery is 1.0 Ω.

Explanation:

Given that,

Voltage = 12,0 V

Resistance of each resistor = 6.0 Ω

Current = 4.0 A

When three resistors are connected in parallel.

We need to calculate the resistance

Using formula of parallel

$\dfrac{1}{R}=\dfrac{1}{R_{1}}+\dfrac{1}{R_{2}}+\dfrac{1}{R_{3}}$

Here, R₁ = R₂ = R₃

$\dfrac{1}{R}=\dfrac{1}{6}+\dfrac{1}{6}+\dfrac{1}{6}$

$\dfrac{1}{R}=\dfrac{1}{2}$

$R = 2\ \Omega$

The equivalent resistance is

$R_{eq}=R+r$

$R_{eq}=2+r$

We need to calculate the internal resistance

Using ohm's law

$V = IR$

$R_{eq}=\dfrac{V}{I}$

$R+r=\dfrac{V}{I}$

Where, R = resistance

r = internal resistance

V = voltage

I = current

Put the value into the formula

$2+r=\dfrac{12.0}{4.0}$

$r=3.0-2$

$r=1.0\ \Omega$

Hence, The internal resistance of the battery is 1.0 Ω.

6 0

3 years ago

A plane wall with surface temperature of 350°C is attached with straight rectangular fins (k = 235 W/m·K). The fins are exposed

bija089 [108]

Determine the efficiency, heat transfer rate, and effectiveness of each fin.

Answer:

The efficiency of fin is 64.2%,

heat transfer rate 543.03W and

effectiveness of each fin is 21.67.

Explanation:

See the explanation in the attached files.

4 0

4 years ago

I need help answer these questions please

jekas [21]

Answer:

1. 25 J

2. 250 J

3. 900,000 J

4. 7,500 J

Explanation:

1. The distance the wheelbarrow is tilted, d = 0.5 m

The force used to tilt the wheelbarrow, F = 50 N

The work done, W = F × d

∴ W = 50 N × 0.5 m = 25 J

2. Work done, W = Force × Distance

The applied force, F = 50 N

The distance the sand is moved, d = 5 m

∴ W = 50 N × 5 m = 250 J

3. The work done, W = The load lifted × The height to which the load is lifted

∴ W = 90,000 N × 10 m = 900,000 J

The work done, W = 900,000 J

4. The work output of the skateboard = The work input × Efficiency

Given that the skateboard is an ideal machine, we have;

The work output of the skateboard = The work input = W

W = F × d

F = 15 N, d = 500 m

∴ W = 15 N × 500 m = 7,500 J

The work output of the skateboard = W = 7,500 J.

3 0

3 years ago

Olivia is on a swing at the playground.

maks197457 [2]

Olivia is on a swing at the playground. The kinetic energy is increasing and her potential energy decreasing at point X.

<h3>What is kinetic energy and potential energy?</h3>

The kinetic energy of an object is the ability to do work by virtue of its motion and potential energy is the ability to do work by virtue of its position.

At point W and Z, Olivia is at the maximum displacement from the mean position, where kinetic energy is zero and potential energy is maximum.

At point Y, it is approaching to increase its potential energy and decreasing kinetic energy. Opposite to this, at point X, kinetic energy is increasing and potential energy is decreasing.

Thus, the kinetic energy is increasing and her potential energy decreasing at point X.

Learn more about kinetic energy and potential energy.

brainly.com/question/15764612

#SPJ1

7 0

2 years ago

Which phrase is evidence of the limits of what science can study?

Furkat [3]

Answer:GIVE ME ANSWERRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR

Explanation: ujhbuewgruh guygdsfytdfty sabjkxnfcjizhuihbtdastged7asgbn&Tgsagyaugdy7sgb67qYGSHFHUDUB8D T IFGJHIGFJHIGJF HELP ME I NEED THE ANSWER

5 0

3 years ago