Electricity Fundamentals - Grade 10

Coulomb

Electron

<p>V = W/Q</p> Signup and view all the answers

<p>Voltmeter</p> Signup and view all the answers

<p>Ammeter</p> Signup and view all the answers

<p>Opposite to the direction of electron flow</p> Signup and view all the answers

<p>Obstruction offered to the flow of charges (current)</p> Signup and view all the answers

<p>R = P * L / A</p> Signup and view all the answers

<p>Ohm-meter</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>The potential difference (V) across the ends of a metallic conductor is directly proportional to the current (I) flowing through it provided its temperature remains the same.</p> Signup and view all the answers

<p>V = I * R</p> Signup and view all the answers

<p>watt</p> Signup and view all the answers

<p>P = V * I</p> Signup and view all the answers

<p>Joule</p> Signup and view all the answers

<p>E = P * t</p> Signup and view all the answers

<p>By multiplying the number of units (kWh) by the price of the unit</p> Signup and view all the answers

<p>Electric current = The flow of electric charge Voltage = The potential difference between two points in a circuit Resistance = The opposition to the flow of electric current Power = The rate at which energy is transferred or used Energy = The ability to do work</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Joule's Law of Heating</p> Signup and view all the answers

<p>Electric Fan (B)</p> Signup and view all the answers

<p>Tungsten has a high melting point and can withstand the high temperatures generated when electricity flows through it.</p> Signup and view all the answers

<p>To prevent short circuits by interrupting the flow of current when the current exceeds a safe limit.</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Ampere</p> Signup and view all the answers

<p>The current flowing through a conductor is known as one ampere if one coulomb of charge flows through it in one second.</p> Signup and view all the answers

<p>Volt</p> Signup and view all the answers

<p>The potential difference between two points is said to be 1 volt if 1 Joule of work is done in moving a positive charge of 1 Coulomb from one point to the other.</p> Signup and view all the answers

<p>Ohm</p> Signup and view all the answers

Two types: positive (+) and negative (-). SI unit is Coulomb (C).

Smallest independent charge, negative charge of 1e = 1.6 x 10⁻¹⁹ C.

Rate of flow of charge; measured in Amperes (A).

Work done in moving 1 Coulomb of charge between two points; measured in Volts (V).

V = W/Q, where W is work done and Q is charge.

Obstruction to the flow of current; measured in Ohms (Ω).

V = IR; Voltage is directly proportional to current at constant temperature.

Property of a material to resist current, measured in Ωm.

Same current through all components; total resistance is the sum of individual resistances.

Same voltage across all components; current can differ.

Rate of energy consumption; measured in Watts (W). P = VI.

Energy supplied by a cell; measured in Joules (J). E = P x t.

When current passes through a conductor, it produces heat.

H = i²Rt; heat produced in a resistor is proportional to the square of current.

Safety device that melts to stop current flow during overload.

SI unit of electric charge.

SI unit of electric current; 1 A = 1 C/s.

SI unit of potential difference; 1 V = 1 J/C.

SI unit of resistance; 1 Ω = 1 V/A.

Unit of energy; 1 kWh = 3.6 x 10⁵ J.

Resistance depends on length, area, material, and temperature.

Made of tungsten; emits light when heated.

Device used to measure current in a circuit.

Device used to measure potential difference.

Continuous and closed path for electric current.

P = VI; power can also be calculated as P = i²R or P = V²/R.

Cost calculated as number of units consumed × price per unit.