Circuits

Yes it is, when there's a large-scale average motion in one direction due to a

voltage between the ends of the wire, and not just the random thermal motion

in a piece of wire in the back of a drawer somewhere.

The function of the bulb in a flashlight is to generate some light when some electrical

current passes through it.

Note: That's actually the whole purpose of the flashlight. If there were no part of it

that generated any light, then you do just as well without the flashlight altogether.

Because there's room inside for more "threads" of current from one end to the other.

A good comparison to help us think about it is a road that a great many drivers want to

use on their way from 'A' to 'B'. More cars can be accommodated if we make the road

'thicker' ... by widening it and adding more lanes for traffic.

A pressure switch works by responding to changes in pressure levels. When the pressure reaches a preset point, the switch triggers a change in the electrical circuit, either turning on or off a connected device. It does this by physically opening or closing internal contacts within the switch.

Since the resistance of ordinary wire is so small, a large current (Amps) flows in

the coil. It most likely stresses the power supply, and the wire most likely gets hot.

But as long as the hook-up lasts, you've got a significant magnetic field inside the coil.

You can pick up pins, needles, and paper clips with it, and shoot nails through the

center along the axis of the coil when the DC is switched on.

firstly a galvanometer instrument measures very small amounts of current flow

of a D,C, nature / type .

an a.c. type circuit is likely to be of a high magnitude , such that it would render the instrument unusable and dangerous to the operator .

also a galvanometer by design is known as a moving coil type meter ,

if an ac signal were to be connected to this, the rate of change of the ac signal voltage would be so fast / frequent that the user would be unaware that the signal is currently changing

If a person is simply hanging from the power line, not touching anything else, nothing much will happen. This is also the reason why birds can sit on power lines, and squirrels can run along them without injury.

However, if the person hanging form the power line completes a circuit by touching anyhting through which current can flow, that person will be electrocuted and may not survive the experience. Items that could be touched and cause electrocution include vehicles, ladders, power poles, trees and shrubs, kite strings, other power lines operating at different voltage, among other things.

To produce the brightest possible light, bulbs should be arranged in parallel to each other. For this purpose,

1. Connect one of the terminals of first bulb with any of the terminals of the other bulb. Let us name this joint as 1

2. Now, connecting the remaining terminal of both of the bulbs together. Let us name this joint as 2

3. now, connect one terminal of the power source with joint 1 and other terminal with joint 2 to get maximum brightness.

It depends on the circuit design and ratings, and what you expect from the bulbs.

Bulbs connected in series with each other will have the same amount of current

flowing through each one, but possibly differing voltages dropped across them,

depending on their ratings. Also, with bulbs connected in series, if any single

bulb burns out, or is switched off, or is removed from its socket, then all of the

bulbs in the series circuit go dark.

Bulbs connected in parallel will have the same voltage across each one, but

possibly differing currents through them, depending on their ratings.

Always check what type of circuit is in use and what it is designed to do, and

ensure the appropriate rating of lamps are used.

That depends on the specific material of the insulator versus the specific

material of the metal. But the answer is easily in the millions.

This is your lucky day! Just for you, today, we're having a special. I went

and found a list with actual numbers and everything, and I compared glass

with copper.

Depending on the composition of the glass, the ratio of resistivities is

between 5.95 billion billion and 5.85 thousand billion billion.

I have to thank you for posting this question, because I've never looked at

a list of these before, and I found some more interesting comparisons.

(The actual numbers are down at the bottom.)

-- Silver, the best conductor by just a bit, has 5.4% less resistivity than copper.

-- Gold . . . 45.2% greater resistivity than copper

-- Iron . . . 4.1 times the resistivity of Gold, 6.0 times that of Copper

-- Lead . . . 2.2 times the resistivity of Iron, 13.1 times that of Copper

-- Nichrome, the resistor wire used for the heating coil in a toaster . . .

5 times the resistivity of Lead, 65.5 times that of Copper

-- Teflon . . . 1 billion to 10 thousand billion times the resistivity of Glass,

5.95 million trillion trillion to 5.95 hundred million trillion trillion times that of Copper

====================================

Silver. . . . . 1.59 x 10-8 ohm-meter

Copper . . . 1.68 x 10-8

Gold. . . . . . 2.44 x 10-8

Iron . . . . . . 1.0 x 10-7

Lead . . . . . 2.2 x 10-7

Nichrome . . 1.1 x 10-6

Glass . . . . . 1011 to 1014

Teflon. . . . . 1023 to 1025

Of what ? ! ?

It's typically a few volts DC for a battery, 120 volts AC for a household outlet in

North America, either zero or 5 volts DC at the output of a TTL logic device, and

anything at all for various kinds of oscillators, drivers, or power supplies.

Copper and aluminum are not attracted to magnets because they are non-magnetic materials. Unlike iron, nickel, or cobalt, which are attracted to magnets, copper and aluminum do not have magnetic properties.

A switch in an electric circuit is used to control the flow of electricity. It can be opened to interrupt the flow or closed to allow electricity to pass through. Switches are commonly used to turn devices on or off in electrical systems.

Electric current is produced when there is a flow of electric charge in a circuit. This flow of charge is typically generated by a voltage source, such as a battery or power supply, which creates a potential difference that pushes the electrical charge around the circuit.

The power dissipated in a resistor can be calculated using the formula P = I^2 * R, where P is power, I is current, and R is resistance. Plugging in the values given, we get P = (0.02 A)^2 * 300 ohms = 0.012 watts. Therefore, the power dissipated in the 300-ohm resistor with a current of 20 mA is 0.012 watts.

In a circuit, a cell acts as a power source by providing electrical energy to power lights and motors. It converts chemical energy stored within it into electrical energy that can be used to produce light in bulbs or generate motion in motors. The flow of electrons from the cell through the circuit is what ultimately powers these devices.

Two common ways to wire an electric circuit are in series, where the components are connected one after another in a single pathway for the current to flow through, and in parallel, where the components are connected in separate branches to the power source, allowing the current to flow through multiple paths simultaneously.

The figure of merit is used to evaluate the performance of a sensor by considering factors like sensitivity, resolution, and noise. Current sensitivity specifically refers to the ability of a sensor to respond to changes in current. A higher figure of merit indicates better overall sensor performance, which can be influenced by the current sensitivity of the sensor.

The circuit by itself doesn't determine the voltage of the power supply.

If there's some additional requirement that goes along with the circuit, such as

"The current through the circuit must be XYZ amperes.", or "The voltage across

the third component from the north end of the circuit shall be ABC volts,", then

that requirement would dictate the power supply voltage. But in order to calculate

it, you'd need the knowledge of every component in the series circuit.

Reactance (in ohms) = 1/(2 pi * capacitance * frequency).

Capacitance is in farads. Frequency is in Hertz (cycles/second).

So increasing capacitance or increasing frequency will decrease reactance.

An insulator is a material that does not easily allow the flow of electricity or heat through it. This is due to its high resistance to the movement of electrons or thermal energy. Insulators are commonly used to prevent the loss of energy or to protect against electric shocks.

The type of energy present in a barbell being lifted or a shot-put being thrown is primarily mechanical energy. Mechanical energy is the sum of an object's potential and kinetic energy due to its position or motion.

To make electrons move along a wire, a source of electrical voltage (such as a battery or power supply) is needed to provide the push or force for the electrons to move. Additionally, there must be a closed circuit or path for the electrons to flow through, typically provided by a conductor like a metal wire.