Electricity and Resistance Concepts

The resistance of a conductor is directly proportional to its length, meaning that as the length increases, resistance increases.

Resistivity is a material's intrinsic property that measures its opposition to current flow, while resistance is the opposition to current flow in a specific conductor.

Resistance is directly proportional to the temperature, meaning higher temperatures typically lead to higher resistance.

<p>The resistance of a uniform metallic conductor is inversely proportional to the area of cross-section; as the area increases, the resistance decreases.</p> Signup and view all the answers

<p>The resistivity of the material remains the same regardless of changes in length.</p> Signup and view all the answers

<p>Glass has the highest resistivity, which ranges from $10^{10}$ to $10^{14}$ Ωm.</p> Signup and view all the answers

<p>The nature of the material determines its resistivity, which in turn affects its resistance under specific conditions.</p> Signup and view all the answers

<p>Resistivity changes with temperature; as the temperature increases for most conductors, resistivity also typically increases.</p> Signup and view all the answers

<p>An ammeter is connected in series to measure current, while a voltmeter is connected in parallel to measure voltage.</p> Signup and view all the answers

<p>Ohm's Law establishes the relationship between voltage, current, and resistance, allowing for the calculation of one variable when the others are known.</p> Signup and view all the answers

<p>Resistance opposes the flow of electric current and is measured in Ohms (Ω).</p> Signup and view all the answers

<p>If resistance is doubled with constant voltage, the current will be halved according to Ohm's Law ($I = \dfrac{V}{R}$).</p> Signup and view all the answers

<p>The V-I characteristic graph depicts a straight line, indicating a direct proportionality between voltage and current in an ideal conductor.</p> Signup and view all the answers

<p>An ammeter must have low resistance to ensure it does not significantly affect the current flow in the circuit.</p> Signup and view all the answers

<p>Coulomb's law states that unlike charges attract each other, while like charges repel.</p> Signup and view all the answers

<p>Resistance is a property of a material that opposes the flow of electric current, affecting how easily current can pass through a circuit.</p> Signup and view all the answers

<p>Resistance can be calculated using the formula $R = \dfrac{V}{I}$, where V is voltage and I is current.</p> Signup and view all the answers

<p>Electric current is the rate of flow of charge through a conductor, measured in Amperes (A).</p> Signup and view all the answers

<p>The potential difference is calculated using the formula $V = \dfrac{W}{Q}$, where W is work done and Q is charge.</p> Signup and view all the answers

<p>Conductors allow electric current to flow easily, semiconductors have intermediate conductivity, and insulators do not allow current to flow.</p> Signup and view all the answers

<p>In this formula, R represents resistance, ρ is resistivity, L is the length of the conductor, and A is its cross-sectional area.</p> Signup and view all the answers

<p>Charge quantization states that a charged particle's charge is an integral multiple of the elementary charge $e$, represented as $Q = ne$.</p> Signup and view all the answers

<p>That current is 1 Ampere (A).</p> Signup and view all the answers

<p>The potential difference is 7 Volts (V), calculated as $V = \dfrac{14}{2} = 7V$.</p> Signup and view all the answers

<p>Increasing the diameter of a wire decreases its resistance because resistance is inversely proportional to the cross-sectional area.</p> Signup and view all the answers

<p>The total resistance in a series circuit is calculated using the formula $R_{s} = R_{1} + R_{2} + R_{3}$.</p> Signup and view all the answers

<p>In a parallel circuit, the total current increases when more resistors are added because the overall resistance decreases.</p> Signup and view all the answers

<p>The effective resistance is 1 Ω, calculated as $R = \dfrac{2 \times 2}{2 + 2} = 1 \text{ Ohm}$.</p> Signup and view all the answers

<p>The wire with a diameter of 0.2 mm will have more resistance because it has a smaller cross-sectional area.</p> Signup and view all the answers

<p>The equivalent resistance for resistors in parallel is given by $1/R_{p} = 1/R_{1} + 1/R_{2} + 1/R_{3}$.</p> Signup and view all the answers

<p>In a series circuit, the total voltage across the resistors is the sum of the individual voltage drops across each resistor.</p> Signup and view all the answers

<p>The resulting resistance is 2.4 Ω, calculated as $R_{net} = \dfrac{4 \times 6}{4 + 6} = 2.4 \text{ Ohms}$.</p> Signup and view all the answers

<p>The relationships are $R_B = rac{1}{2} R_A$ and $R_C = 2R_A$.</p> Signup and view all the answers

<p>The length can be calculated using the formula $l = \frac{RA}{ρ}$.</p> Signup and view all the answers

<p>Ohm's law states that current is proportional to voltage and inversely proportional to resistance.</p> Signup and view all the answers

<p>Electric charge is a fundamental property of matter measured in coulombs (C), equal to the charge of $6.24 \times 10^{18}$ electrons.</p> Signup and view all the answers

<p>Electric current is the flow of electric charge, measured in amperes (A).</p> Signup and view all the answers

<p>Resistors oppose the flow of electric current within a circuit.</p> Signup and view all the answers

<p>Electric potential difference is the work needed to move a unit charge between two points, measured in volts (V).</p> Signup and view all the answers

<p>Like charges repel each other, while unlike charges attract, resulting in electrostatic forces.</p> Signup and view all the answers