Total Resistance in Circuits

This video tutorial covers Module 26 of the NCCER 11th Edition on electrical theory, focusing on resistive circuits. It explains how to calculate total resistance in series and parallel circuits using various methods, including the reciprocal and product over sum methods. The tutorial also covers series-parallel circuits, providing guidance on finding current, voltage, and resistance. The session concludes with a review of key concepts and practice questions to reinforce learning.

In a series circuit, how is the total resistance determined?

• By dividing the total voltage by the total current

• By adding all resistances

• By multiplying all resistances

• By subtracting the smallest resistance from the largest

Which method is NOT used to calculate total resistance in parallel circuits?

• Method for equal resistances

• Product over sum method

• Reciprocal method

• Voltage division method

What is the total resistance of a 2, 4, and 8 Ohm resistor in parallel using the reciprocal method?

• 2.5 ohms

• 3.33 ohms

• 0.875 ohms

• 1.14 ohms

Using the product over sum method, what is the total resistance of a 5 and 10 Ohm resistor in parallel?

• 7.5 ohms

• 3.33 ohms

• 15 ohms

• 5 ohms

How do you calculate the total resistance of equal resistors in parallel?

• Multiply the resistance of one by the number of resistors

• Divide the resistance of one by the number of resistors

• Add the resistance of one to the number of resistors

• Subtract the resistance of one from the number of resistors

What is the total resistance of two 200 ohm resistors and one 100 ohm resistor in parallel?

• 75 ohms

• 50 ohms

• 125 ohms

• 100 ohms

In a series-parallel circuit, what should you do to simplify the circuit?

• Add all resistances together

• Redraw the circuit to identify branches and loads

• Use only the series rules

• Ignore the parallel components

What is a key characteristic of a parallel circuit?

• The current flow is the same through all components

• The total resistance is the sum of individual resistances

• It has more than one path for current flow

• It has only one path for current flow

Which statement is true about a series-parallel circuit?

• There is only one path for current flow

• The resistance is the same through all components

• Once reduced to an equivalent series circuit, the total resistance is found by adding the series loads

• The current flow through each resistor is always more than half the value of the total resistance

Ohm's law can be used to find the value of each branch in which type of circuit?

• Series-parallel circuit

• Parallel circuit

• None of the above

• Series circuit