Unit 3: Electricity Flashcards
(66 cards)
What is a Ammeter?
An ammeter is an instrument used to measure the current in a circuit. Electric currents are measured in amperes, hence the name. For direct measurement, the ammeter is connected in series with the circuit in which the current is to be measured
What is a battery?
An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. When a battery is supplying power, its positive terminal is the cathode and its negative terminal is the anode
What is a ampere?
base unit of electrical current.
What is current?
An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface.
What is a fuse?
A fuse is a safety device in an electrical circuit that protects against excessive current. It contains a thin, conductive wire or strip that melts and breaks the circuit if the current flowing through it exceeds a predetermined limit.
What is a kilowatt-hour?
A kilowatt-hour (kWh) is a unit of energy measurement, specifically for electricity. It represents the amount of energy used when a 1,000-watt (1 kilowatt) appliance runs for one hour. For example, if you run a 1,000-watt vacuum cleaner for one hour, you’ve consumed 1 kWh of energy. It’s a common way to measure energy consumption for homes and businesses, as energy bills are often calculated in kWh.
What is a load?
In electricity, a load is any component in a circuit that consumes power. It’s essentially anything that transforms electrical energy into another form, like light, heat, or mechanical work. Common examples include light bulbs, heating elements, electric motors, and appliances.
What is a ohm (Ω)?
ohm is a unit of electrical resistance, measured in the International System of Units (SI) with the symbol Ω (omega). It is a fundamental unit in understanding and working with electrical circuits.
What is potential difference?
the difference of electrical potential between two points.
What is resistance?
In electricity, resistance is the opposition to the flow of electric current through a material or component. It’s measured in ohms (Ω) and represents how much a material resists the passage of electric charge. Factors like the material’s properties, length, cross-sectional area, and temperature influence resistance.
What is a switch?
a switch is a fundamental electrical component used to control the flow of electricity in a circuit. It functions by opening or closing an electrical circuit, effectively turning a device or system on or off.
What is a voltmeter?
A voltmeter is a device used to measure the electrical potential difference, or voltage, between two points in an electrical circuit. It’s essentially a gauge that tells you how much “electrical push” or “energy” is present between those two points.
What is a volt?
the SI unit of electromotive force, the difference of potential that would drive one ampere of current against one ohm resistance.
What is static electricity?
Static electricity is the accumulation of an electric charge, usually on the surface of an object, due to an imbalance of electrons. It occurs when two materials rub together, causing electrons to transfer from one material to another. This creates an imbalance, with one material becoming positively charged (lacking electrons) and the other becoming negatively charged (having excess electrons).
What is current electricity?
current electricity is the flow of electric charge (usually electrons) through a wire or other conductor. This flow is what powers our homes and devices, like turning on a light bulb or running a computer. Think of it like a river of electricity flowing through a pipe
What is a series circuit?
a series circuit is a type of electrical circuit where all components are connected end-to-end, forming a single path for the current to flow. This means the current travels through each component sequentially without branching off. A simple example is a string of old-fashioned Christmas lights, where if one bulb burns out, the entire string goes dark.
What is a parallel?
A parallel circuit in electricity is a circuit where multiple paths exist for the current to flow. Each component in a parallel circuit is connected across the same two points, meaning they all have the same voltage. If one component in a parallel circuit fails, the others can still function because they have independent paths.
What is a cell?
In the context of electricity, a cell is a basic unit that converts chemical energy into electrical energy, or uses electrical energy to cause chemical reactions. It’s the fundamental building block of a battery and can be single-use or rechargeable.
What is a resistor?
A resistor is a passive electronic component that restricts the flow of electric current in a circuit. It’s like a “traffic jam” for electrons, limiting the amount of current that can pass through. This restriction of current is known as resistance.
What is a phantom load?
A phantom load, also known as standby power or vampire power, is the electricity consumed by electronic devices when they are plugged in but not actively in use, even when they are seemingly turned off. These devices continue to draw power to keep features like clocks, LEDs, remote controls, or Wi-Fi connectivity functional.
What is a proton?
a positively charged particle
What is a electron?
a negatively charged particle
What is charge by contact?
Charging by contact, also known as charging by conduction, is a method of transferring electric charge from one object to another by making physical contact. A charged object is brought into contact with a neutral object, and some of the excess charge from the charged object is transferred to the neutral object, resulting in both objects becoming charged.
What is charge by induction?
induction charging is a charging method that charges an object without actually touching the object to any other charged object. The charging by induction process is where the charged particle is held near an uncharged conductive material that is grounded on a neutrally charged material.
