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Questions and Answers

In a parallel circuit, what happens to the current as it flows through different branches?

The current increases exponentially in each branch.
The current splits between different paths. (correct)
The current stops flowing entirely.
The current remains the same in all branches.

An ammeter is used to measure potential difference in a circuit and is connected in parallel with the component being measured.

False (B)

What are the three primary factors that affect the resistance of a wire?

length, thickness, and temperature

According to Ohm's Law, the voltage in a circuit is equal to the current multiplied by the ________.

resistance Signup and view all the answers

Match the circuit component with its function:

Power Source = Provides voltage to drive current Ammeter = Measures current in amperes Voltmeter = Measures potential difference in volts Resistor = Opposes the flow of current Signup and view all the answers

Which of the following materials is a good conductor of electricity?

Copper (B) Signup and view all the answers

What happens to the current in a circuit if the voltage is doubled and the resistance remains constant?

The current is doubled. (C) Signup and view all the answers

Which of the following describes alternating current (AC)?

Electrons change direction periodically. (A) Signup and view all the answers

A box is pushed to the right with a force of 15N and friction acts against it with a force of 15N. What is the best description of this scenario?

Balanced forces, resulting in no change in motion. (A) Signup and view all the answers

An object's mass changes depending on its location in the universe.

False (B) Signup and view all the answers

Explain how the weight of an object differs on Earth compared to on the Moon.

The weight of an object is less on the Moon because the Moon has a weaker gravitational field strength than Earth, so the gravitational force exerted on the object is less. Signup and view all the answers

A large cloud of gas and dust in space where stars are born is called a ______.

nebula Signup and view all the answers

Match the celestial objects with their descriptions:

Star = Massive celestial body that emits light and heat. Planet = Celestial body that orbits a star. Asteroid = Small rocky body orbiting the Sun. Galaxy = Large system of stars, gas, and dust held together by gravity. Signup and view all the answers

Which factor does NOT increase the strength of an electromagnet?

Decreasing the current (B) Signup and view all the answers

The needle of a compass aligns with Earth's geographic North Pole.

False (B) Signup and view all the answers

What rule helps determine the direction of the magnetic field around a current-carrying wire?

Right-Hand Grip Rule Signup and view all the answers

The effect where a current-carrying wire experiences a force when placed in a magnetic field is called the ______.

Motor Effect Signup and view all the answers

Match the following rules/principles with their respective function:

Right-Hand Grip Rule = Determines the direction of the magnetic field around a current-carrying wire Fleming's Left-Hand Rule = Determines the direction of the force on a current-carrying wire in a magnetic field Electromagnet = Magnet created when electric current flows through a coil of wire Compass = A navigational instrument that uses Earth's magnetic field to indicate direction Signup and view all the answers

Which of the following is an example of an exothermic reaction?

Combustion reactions (C) Signup and view all the answers

Endothermic reactions release energy into their surroundings.

False (B) Signup and view all the answers

According to Fleming's Left-Hand Rule, which finger indicates the direction of the magnetic field?

First finger Signup and view all the answers

In a circuit with constant voltage, what happens to the current if the resistance is increased?

The current decreases. (D) Signup and view all the answers

In parallel circuits, the total resistance increases, causing lower current flow.

False (B) Signup and view all the answers

Explain how static electricity is generated between two objects.

Static electricity occurs when electrons are transferred between objects due to friction, leading to an imbalance of charge. Signup and view all the answers

Objects with opposite charges , while like charges .

attract, repel Signup and view all the answers

Match the following applications with the principle of static electricity they utilize:

Paint Sprayers = Charged paint particles stick to surfaces evenly. Photocopiers = Electrostatic attraction of toner to charged areas on a drum. Lightning = Sudden discharge of static charge buildup in clouds. Signup and view all the answers

What materials are naturally magnetic?

Iron, nickel, and cobalt. (B) Signup and view all the answers

Magnetic field lines travel from South to North outside a magnet.

False (B) Signup and view all the answers

What is the primary cause of Earth's magnetic field?

The movement of molten iron in the Earth's core. (C) Signup and view all the answers

Flashcards

Electrical Circuit

A closed path allowing electric charge to flow.

Series Circuit

Components are arranged in a single path; current is the same throughout.