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ECG Measurements and Abnormal Heart Rhythms

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ECG Measurements and Abnormal Heart Rhythms

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Questions and Answers

Which of the following is true about electric charge?

An electron has a positive charge.

A neutron has no charge.

A proton has a negative charge.

A proton and an electron have the same charge. (correct)

What is the SI unit of charge?

Volt

Coulomb (correct)

Ohm

Ampere

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

Plastic

Rubber

Copper (correct)

Wood

Which device is used to measure the electrical potential differences on the surface of the skin?

ECG machine Signup and view all the answers

What is the SI unit of capacitance?

Farad (F) Signup and view all the answers

What is the formula for calculating capacitance?

C = KVd Signup and view all the answers

What is the SI unit of electric current?

Ampere (A) Signup and view all the answers

According to Coulomb's law, the force between two electric charges is directly proportional to the product of the charges and inversely proportional to their separation squared. Which of the following statements is true about the force between two charges?

The force is attractive if the charges have opposite signs Signup and view all the answers

What is the magnitude and direction of the electric force acting on q2, if q1 = 4μC, q2 = 3μC, and the distance separating them is 1m?

0.108 N, East (+x) Signup and view all the answers

Which of the following materials is an insulator?

Glass Signup and view all the answers

What is polarization?

The separation of charge within an object that has a net charge Signup and view all the answers

According to the text, which of the following is true about Ohmic materials?

The resistance of Ohmic materials is constant and independent of the potential difference. Signup and view all the answers

What is the resting membrane potential of a nerve cell?

-70 to -90 mV Signup and view all the answers

What happens to the cell membrane permeability during an active potential?

The cell membrane permeability to sodium increases suddenly. Signup and view all the answers

What is the relationship between signal conduction velocity in a nerve axon and capacitance?

Signal conduction velocity is inversely proportional to capacitance. Signup and view all the answers