Static Electricity and Electric Charges

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Questions and Answers

What is the primary cause of static electricity?

Imbalance of electric charge (correct)

Constant flow of current

Absence of electrons

Movement of protons

A negative charge will attract another negative charge.

False (B)

List the three ways to charge an object.

Friction, contact (conduction), induction.

When two neutral objects come in contact, electrons are transferred, leading to __________.

static electricity Signup and view all the answers

Match the following terms with their definitions:

Conductor = Material that allows electric charges to flow easily Insulator = Material that resists electric charge flow Grounding = Process of discharging an object by connecting to the earth Induced Charge Separation = Separation of charges in a neutral object due to the influence of a charged object Signup and view all the answers

Which of the following is NOT a method to charge an object?

Alloying (C) Signup and view all the answers

Electroscopes can only detect positive charges.

False (B) Signup and view all the answers

What phenomenon explains how charged objects can be attracted to neutral objects?

Induced charge separation. Signup and view all the answers

The law of electric charges states that like charges and opposite charges .

repel, attract Signup and view all the answers

What is electric discharge?

The release of accumulated electric charge. (C) Signup and view all the answers

What is the result of grounding a charged object?

It loses its electric charge. Signup and view all the answers

Lightning is a form of electric discharge.

True (A) Signup and view all the answers

Name one useful application of lightning rods.

They prevent buildings from being struck by lightning. Signup and view all the answers

A _____ is a device that converts electrical energy into light and heat.

light bulb Signup and view all the answers

Which of the following is NOT a main form of current electricity?

Resistive Current (C) Signup and view all the answers

Match the types of cells to their characteristics:

Primary Cell = Can only be used once Secondary Cell = Can be recharged Signup and view all the answers

An open circuit allows electricity to flow.

False (B) Signup and view all the answers

What are two financial costs to consider when purchasing an electrical device?

The initial purchase cost and the operating cost. Signup and view all the answers

The efficiency of a compact fluorescent light bulb is determined by the ratio of _____ energy output to energy input.

light Signup and view all the answers

List three ways to conserve electrical energy.

Use energy-efficient appliances, turn off devices when not in use, and utilize natural light. Signup and view all the answers

What is the calculated efficiency of a compact fluorescent light bulb that produces 30 J of light energy and uses 95 J of electrical energy?

31.6% (B) Signup and view all the answers

The cost to operate a 7W LED light bulb for 24 hours a day for a year is $39.85.

True (A) Signup and view all the answers

What is the difference between a battery and a cell?

A cell is a single electrochemical unit, whereas a battery consists of multiple cells. Signup and view all the answers

The unit for current is called ______.

amps Signup and view all the answers

Match the following concepts with their definitions:

Series Circuit = All components are connected along a single path. Parallel Circuit = Components are connected across common points. Ammeter = Device used to measure electric current. Resistance = Opposition to the flow of electric current. Signup and view all the answers

Which type of circuit is most commonly found in your house?

Parallel Circuit (C) Signup and view all the answers

Electric shocks are dangerous mainly because they can kill you.

False (B) Signup and view all the answers

What is meant by the 'let go threshold'?

It is the maximum current level at which a person can voluntarily let go of an electrically charged object. Signup and view all the answers

The formula to calculate voltage is V= ______ x R.

I Signup and view all the answers

What is the resistance of a light bulb if it has a current of 0.80 A and voltage of 120 V?

60 Ohms (D) Signup and view all the answers

What is the resistance of a heating coil that shows a potential difference of 60 V and a current of 3.0 A?

20 Ω (D) Signup and view all the answers

Alternating current (AC) flows in only one direction.

False (B) Signup and view all the answers

What is needed for electricity to flow?

A closed circuit with a source of electrical energy. Signup and view all the answers

A flashlight bulb connected to a potential difference of 3.0 V with a resistance of 7.5 ohms draws ____________.

0.4 A Signup and view all the answers

Match the following electrical components with their functions:

Resistor = Limits current flow Capacitor = Stores electrical energy Switch = Controls the circuit Battery = Supplies electrical energy Signup and view all the answers

What is the difference between an open circuit and a closed circuit?

An open circuit has a break, preventing current flow, whereas a closed circuit is complete. (C) Signup and view all the answers

Renewable resources are becoming less popular due to their environmental impact.

False (B) Signup and view all the answers

Name one disadvantage of using renewable energy.

Intermittency, as many renewable sources can depend on weather conditions. Signup and view all the answers

A photovoltaic cell converts ___________ energy into electrical energy.

solar Signup and view all the answers

What type of electrical current is produced in a nuclear power plant?

Alternating current (AC) (C) Signup and view all the answers

Study Notes