Introduction to Electrical Charge and Current: Definition and Calculation

The video tutorial explains electric current as the flow of electric charge in a circuit, measured by the amount of charge passing a point per second. It discusses factors affecting current size, such as charge density, and emphasizes the conservation of current in circuits. The tutorial introduces the equation Q = I * T for calculating current, charge, or time, and provides examples to illustrate its application. The video concludes with a summary of key points on electrical charge and current.

What is electric current defined as?

• The resistance in a circuit

• The voltage across a circuit

• The amount of electrical charge passing a point per second

• The speed of electrons in a wire

Which factor primarily affects the size of an electric current?

• The length of the circuit

• The type of battery used

• The color of the wire

• The amount of charge passing a point per second

Why is a battery necessary for current to flow in a circuit?

• It increases the resistance in the circuit

• It attracts and repels electrons to create a flow of charge

• It decreases the voltage in the circuit

• It provides a path for the current

What does the equation Q = I * T represent?

• The relationship between voltage, current, and resistance

• The relationship between energy, charge, and time

• The relationship between power, voltage, and current

• The relationship between charge, current, and time

If a current of 0.2 amps flows through a bulb for 120 seconds, how much charge passes through?

• 36 Coulombs

• 24 Coulombs

• 12 Coulombs

• 48 Coulombs

How much current flows through a phone charger if 3600 Coulombs pass through in 7200 seconds?

• 0.2 Amperes

• 0.5 Amperes

• 0.3 Amperes

• 0.6 Amperes

How long does it take for 100 Coulombs to pass through a bulb drawing 1.6 amps?

• 87.5 seconds

• 50 seconds

• 75 seconds

• 62.5 seconds