Electrical Circuits Ohms Law 1 Circuit Diagrams 2

1) Circuit Diagrams • Circuit Diagram: a diagram that uses standard _______ to represent

2) Series vs. Parallel Circuits Series circuit: a circuit in which there is __________

Check your understanding: 1) Label the following diagrams as series, parallel, or combination. (Note:

Check your understanding: 1) Label the following diagrams with series or parallel.

Review of Electrical Circuit Characteristics Characteristic Definition Unit of Measurement How is it measured?

Check your understanding: 2) Draw a circuit diagram that shows a two-cell battery in

Ohm’s Law • For most wires, the ratio of potential difference (V) to current

Solving Problems - GRASP G = Given – List known, draw diagrams R =

Sample Problem 1. Find the current through a 12 Ω resistor when 24 V

Check your understanding 1. A circuit consists of a 12 V battery connected across

Sample Problem 2. An electric toy has a resistance of 120 Ω and requires

Check your understanding 2. A circuit, in series, consists of a 225 V battery

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Electrical Circuits & Ohm’s Law 1) Circuit Diagrams 2) Series Circuits vs. Parallel Circuits 3) Ohm’s Law Calculations

1) Circuit Diagrams • Circuit Diagram: a diagram that uses standard _______ to represent the components in an electric ________ and their connections. In this case, the “resistance” is the ________ in the _____.

2) Series vs. Parallel Circuits Series circuit: a circuit in which there is __________ path along which electrons can flow. • Series connections: specific places in a series circuit where components are connected. (One way) Parallel circuit: a circuit in which there is __________ path along which electrons can flow. • Parallel connections: specific parts of a parallel circuit where there are more than one pathway. (Branched) Most circuits in the real world are combinations of series and parallel circuits.

Check your understanding: 1) Label the following diagrams as series, parallel, or combination. (Note: the longer line of a the cell represents the positive terminal). ( Hint: trace your finger from the (–) terminal to the (+) terminal).

Check your understanding: 1) Label the following diagrams with series or parallel.

Review of Electrical Characteristics

Review of Electrical Circuit Characteristics Characteristic Definition Unit of Measurement How is it measured? River Analogy Current (___) Resistance (___) Voltage (____) _________

Check your understanding: 2) Draw a circuit diagram that shows a two-cell battery in series with a switch and two lamps in parallel. Include an ohmmeter correctly connected to one of the lamps.

Ohm’s Law • For most wires, the ratio of potential difference (V) to current (I) is a constant. The constant is called resistance (R)

Solving Problems - GRASP G = Given – List known, draw diagrams R = Required to find – Identify the unknown A = Analyze – Write out formula S = Solve – Plug knowns into formula P = Present – State your answer using a sentence You must GRASP a problem for full marks!

Sample Problem 1. Find the current through a 12 Ω resistor when 24 V are applied across it.

Check your understanding 1. A circuit consists of a 12 V battery connected across a single resistor. If the current in the circuit is 3 A, calculate the size of the resistor.

Sample Problem 2. An electric toy has a resistance of 120 Ω and requires a current of 0. 050 A to work properly. How many 1. 5 V cells does the toy require?

Check your understanding 2. A circuit, in series, consists of a 225 V battery connected to 3 identical resistors. If the current in the circuit is 15 A, calculate the resistance of each resistor.