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# Electric Circuits and Resistance

Created by
@SatisfyingAlder

### What is the primary function of a switch in an electric circuit?

To control the flow of electric current

Ohms

### What happens to the current in a series circuit if one component fails?

The entire circuit is broken

### What is the formula to calculate the total resistance in a parallel circuit?

<p>1/R_total = 1/R1 + 1/R2 +...+ 1/Rn</p> Signup and view all the answers

### What type of energy is transferred from a power source to a light bulb in an electric circuit?

<p>Electrical energy → Light energy</p> Signup and view all the answers

### What is the characteristic of the current in a parallel circuit?

<p>It is divided among the components</p> Signup and view all the answers

## Study Notes

### Electric Circuits

• A path through which electric current flows from a power source, through one or more devices, and back to the power source
• Consists of:
• Power source (e.g. battery)
• Conductors (e.g. wires)
• Switch (optional)

### Resistance

• Opposition to the flow of electric current
• Measured in ohms (Ω)
• Depends on:
• Material of the conductor
• Length of the conductor
• Cross-sectional area of the conductor
• Temperature of the conductor
• Formula: R = ρ * L / A, where ρ is the resistivity of the material

### Series Circuits

• Circuits in which components are connected one after the other
• Characteristics:
• Current is the same throughout the circuit
• Voltage is divided among the components
• If one component fails, the entire circuit is broken
• Formulae:
• Total resistance: R_total = R1 + R2 + ... + Rn
• Total voltage: V_total = V1 + V2 + ... + Vn

### Parallel Circuits

• Circuits in which components are connected between the same two points
• Characteristics:
• Voltage is the same across each component
• Current is divided among the components
• If one component fails, the other components remain unaffected
• Formulae:
• Total resistance: 1/R_total = 1/R1 + 1/R2 + ... + 1/Rn
• Total current: I_total = I1 + I2 + ... + In

### Energy Transfer

• The process of transferring energy from one place to another through electric circuits
• Types of energy transfer:
• Electrical energy → light energy (e.g. light bulb)
• Electrical energy → thermal energy (e.g. heater)
• Electrical energy → kinetic energy (e.g. motor)
• Efficiency: ratio of useful output energy to input energy

### Electric Circuits

• Electric current flows from a power source, through devices, and back to the power source
• Consists of a power source, conductors, load, and an optional switch

### Resistance

• Opposition to electric current flow, measured in ohms (Ω)
• Depends on conductor material, length, cross-sectional area, and temperature
• Formula: R = ρ * L / A, where ρ is the resistivity of the material

### Series Circuits

• Components are connected one after the other
• Characteristics: same current throughout, voltage divided among components, and single component failure breaks the entire circuit
• Formulae: Total resistance: R_total = R1 + R2 +...+ Rn, Total voltage: V_total = V1 + V2 +...+ Vn

### Parallel Circuits

• Components are connected between the same two points
• Characteristics: same voltage across each component, current divided among components, and single component failure doesn't affect other components
• Formulae: Total resistance: 1/R_total = 1/R1 + 1/R2 +...+ 1/Rn, Total current: I_total = I1 + I2 +...+ In

### Energy Transfer

• Process of transferring energy from one place to another through electric circuits
• Types of energy transfer: electrical energy → light, thermal, or kinetic energy
• Efficiency: ratio of useful output energy to input energy

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## Description

This quiz covers the basics of electric circuits, including the components and flow of electric current, as well as resistance, its measurement, and factors that affect it.

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