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Physics 102: Chapter 3 - Current, Voltage and Electrical Power

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Physics 102: Chapter 3 - Current, Voltage and Electrical Power

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Questions and Answers

What is the unit of power?

Watt (correct)

Ampere

Volt

Joule

What is the ability of electrical energy?

To magnetize objects

To generate heat

To apply force to move an object or to do work (correct)

To produce light

What is the formula for power in terms of current and resistance?

P = I/V

P = V^2/R

P = I^2R (correct)

P = VI

A light bulb is rated in ________.

Watts Signup and view all the answers

What is the mathematical formula for power?

P = VI Signup and view all the answers

What is the formula for current in terms of charge and time?

I = Q/t Signup and view all the answers

What is the power consumption of the electric heater in kW?

1.8 kW Signup and view all the answers

How many months were considered to calculate the monthly bill?

1 month Signup and view all the answers

What unit is used to measure the power rate in the given context?

Watts Signup and view all the answers

How does electricity affect muscle cells in the heart?

It causes them to contract Signup and view all the answers

What do ECG machines measure in the heart?

Electrical activity Signup and view all the answers

How does a healthy heartbeat appear on an ECG machine?

Line moving with regular spikes Signup and view all the answers

What is the unit of electromotive force (emf)?

Volt Signup and view all the answers

What type of energy is produced by electrical charges?

Electrical energy Signup and view all the answers

What is the term for moving electrical charge?

Current Signup and view all the answers

What is the term for stored electrical energy?

Potential electrical energy Signup and view all the answers

What is the purpose of a 'heating element' in electric appliances?

To transform electrical energy into thermal energy Signup and view all the answers

What is one of the most common uses of electrical energy?

Running computers and appliances Signup and view all the answers