Electrical Concepts and Calculations

This video tutorial covers the application of Ohm's Law to solve various electrical problems. It begins with calculating current in a basic circuit, then moves on to determining electric charge and the number of electrons passing through a resistor. The tutorial also explains how to calculate voltage across a resistor and the number of batteries needed to achieve a specific voltage. It further explores the resistance and power consumption of a light bulb, and concludes with calculations of power and energy in a circuit, as well as the energy stored in a battery.

What is the current flowing through a 4-ohm resistor connected to a 12-volt battery?

• 3 amps

• 4 amps

• 2 amps

• 1 amp

How much charge flows through the resistor in 5 minutes if the current is 3 amps?

• 1200 coulombs

• 900 coulombs

• 600 coulombs

• 300 coulombs

How many electrons pass through a resistor in one hour if the current is 3 amps?

• 6.74 x 10^22

• 5.00 x 10^22

• 7.50 x 10^22

• 8.00 x 10^22

What is the voltage across a 25-ohm resistor with a current of 0.3 amps?

• 8 volts

• 6.5 volts

• 5 volts

• 7.5 volts

How many AA batteries are needed to produce a voltage of 7.5 volts?

• 3

• 4

• 5

• 6

What is the resistance of a light bulb if a 9-volt battery causes a current of 0.18 amps to flow through it?

• 40 ohms

• 45 ohms

• 50 ohms

• 55 ohms

How much power is consumed by a light bulb with a resistance of 50 ohms and a current of 0.18 amps?

• 1.80 watts

• 1.62 watts

• 1.50 watts

• 2.00 watts

What is the current in a circuit with a 120-volt power source and a 60-ohm resistor?

• 4 amps

• 3 amps

• 2 amps

• 1 amp

How much energy will a resistor consume in one day if it consumes 240 watts continuously?

• 20,736,000 joules

• 22,000,000 joules

• 25,000,000 joules

• 18,000,000 joules

What is the total energy stored in a 12-volt battery with a capacity of 50 amp-hours?

• 3,000,000 joules

• 2,500,000 joules

• 2,160,000 joules

• 1,800,000 joules