Gr 8 Natural Sciences Ch 3.2: Components of a circuit
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Questions and Answers

What is the primary source of energy for an electric circuit?

  • Conductors
  • Electrical cells (correct)
  • Insulators
  • Resistors

What is the purpose of resistors in a circuit?

  • To allow current to pass without resistance
  • To store energy
  • To convert electrical energy into heat (correct)
  • To increase voltage

What is the unit of measurement for resistance?

  • Amperes (A)
  • Ohms (Ω) (correct)
  • Watts (W)
  • Volts (V)

What is a variable resistor used for?

<p>To control current flow dynamically (D)</p> Signup and view all the answers

What is a battery?

<p>Two or more cells connected together (D)</p> Signup and view all the answers

What do conductors allow?

<p>Electric charge to move through them (B)</p> Signup and view all the answers

What do cells come in different sizes of?

<p>Sizes such as AAA, AA, C, D, and 9-volt (C)</p> Signup and view all the answers

What do the colored bands on a resistor represent?

<p>The resistance value (C)</p> Signup and view all the answers

What is represented by a zigzag line in a circuit diagram?

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

What is the symbol for a light bulb in a circuit diagram?

<p>A circle with a cross inside (A)</p> Signup and view all the answers

What is the purpose of a resistor in a kettle heating element?

<p>To convert electrical energy into heat (B)</p> Signup and view all the answers

What is the order of steps to create a simple circuit diagram?

<p>Draw the cells, connect the resistor, add the switch, and connect the bulbs (A)</p> Signup and view all the answers

What is the purpose of a filament in a light bulb?

<p>To convert electrical energy into light (C)</p> Signup and view all the answers

What is represented by a break in the line with an opening or closing line in a circuit diagram?

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

What is the function of cells in an electric circuit?

<p>To provide energy to electrons, enabling the flow of electric current (B)</p> Signup and view all the answers

What is the difference between conductors and insulators?

<p>Conductors allow electric charge to move, while insulators do not (A)</p> Signup and view all the answers

What is the purpose of a battery in an electric circuit?

<p>To increase the capacity of a single cell (D)</p> Signup and view all the answers

What is the symbol for a cell in a circuit diagram?

<p>A pair of parallel lines, one longer and one shorter (B)</p> Signup and view all the answers

What happens when cells are connected in a complete circuit?

<p>The chemicals in the cells react, providing energy to electrons (C)</p> Signup and view all the answers

What is the effect of resistors on the flow of electric current?

<p>They oppose the flow of electric current (D)</p> Signup and view all the answers

What is the main difference between a cell and a battery?

<p>A cell is a single unit, while a battery is two or more cells connected together (D)</p> Signup and view all the answers

What is the function of colored bands on a resistor?

<p>To form a code representing the resistance value (B)</p> Signup and view all the answers

What is the purpose of connecting the negative terminal of the battery back to the other terminal of the last bulb in a circuit diagram?

<p>To complete the circuit (B)</p> Signup and view all the answers

What happens to the electrical energy when it flows through the resistor in a kettle heating element?

<p>It is converted into heat (A)</p> Signup and view all the answers

What does the filament in a light bulb convert electrical energy into?

<p>Heat and light (C)</p> Signup and view all the answers

What is represented by a circle with a cross inside it in a circuit diagram?

<p>A light bulb (C)</p> Signup and view all the answers

What is the purpose of drawing two sets of parallel lines in series to form a battery in a circuit diagram?

<p>To represent multiple cells (A)</p> Signup and view all the answers

What is the effect of electric current flowing through the filament in a light bulb?

<p>The filament heats up and emits light (A)</p> Signup and view all the answers

What is the purpose of drawing a zigzag line in a circuit diagram?

<p>To represent a resistor (C)</p> Signup and view all the answers

What happens when electric current flows through the filament in a light bulb?

<p>The filament heats up and emits light (C)</p> Signup and view all the answers

What is the purpose of the break in the line with an opening or closing line in a circuit diagram?

<p>To represent a switch (C)</p> Signup and view all the answers

What is the function of the heating element in a kettle?

<p>To convert electrical energy into heat (B)</p> Signup and view all the answers

What is the purpose of connecting the negative terminal of the battery back to the other terminal of the last bulb in a circuit diagram?

<p>To complete the circuit (A)</p> Signup and view all the answers

What is represented by a circle with a cross inside it in a circuit diagram?

<p>A light bulb (B)</p> Signup and view all the answers

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

<p>To provide energy to electrons, enabling them to flow through the circuit (D)</p> Signup and view all the answers

What is the effect of a resistor on the flow of electric current?

<p>It opposes the flow of electric current (C)</p> Signup and view all the answers

What is the main difference between a cell and a battery?

<p>A cell is a single unit, while a battery is two or more cells connected together (B)</p> Signup and view all the answers

What is the purpose of a variable resistor?

<p>To control the flow of electric current dynamically (B)</p> Signup and view all the answers

What is represented by a pair of parallel lines, one longer and one shorter?

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

What happens to electrical energy when it flows through a resistor?

<p>It is converted into heat (A)</p> Signup and view all the answers

What is the rating of AAA, AA, C, and D cells?

<p>1.5V (C)</p> Signup and view all the answers

What is the classification of metals in terms of electric current flow?

<p>Conductors (C)</p> Signup and view all the answers

What is the purpose of connecting the resistor to the positive terminal of the battery in a circuit diagram?

<p>To reduce the current flowing through the circuit (B)</p> Signup and view all the answers

What happens to the electrical energy when it flows through the filament in a light bulb?

<p>It is converted into heat and light energy (C)</p> Signup and view all the answers

What is the purpose of drawing two sets of parallel lines in series to form a battery in a circuit diagram?

<p>To represent multiple cells connected together (B)</p> Signup and view all the answers

What is the function of the heating element in a kettle?

<p>To convert electrical energy into heat energy (B)</p> Signup and view all the answers

What is the purpose of drawing a zigzag line in a circuit diagram?

<p>To represent a resistor (A)</p> Signup and view all the answers

What is the purpose of the break in the line with an opening or closing line in a circuit diagram?

<p>To represent a switch (C)</p> Signup and view all the answers

What is the primary function of reactants in an electrical cell?

<p>To store potential energy (C)</p> Signup and view all the answers

What determines the capacity of a cell?

<p>The size of the cell (C)</p> Signup and view all the answers

What is the effect of connecting multiple cells together?

<p>The capacity of the circuit increases (B)</p> Signup and view all the answers

What is the purpose of resistors in controlling the current flow within a circuit?

<p>To convert electrical energy into heat (D)</p> Signup and view all the answers

What is the classification of materials that allow electric charge to move through them?

<p>Conductors (C)</p> Signup and view all the answers

What is the purpose of the symbol for a cell in a circuit diagram?

<p>To represent a cell (B)</p> Signup and view all the answers

What is the function of a variable resistor in a circuit?

<p>To control the current flow dynamically (D)</p> Signup and view all the answers

What happens to electrical energy when it flows through a resistor in a kettle heating element?

<p>It is converted into heat (A)</p> Signup and view all the answers

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