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Current and Simple Circuits Voltage Resistance Safety

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Presentation on theme: "Current and Simple Circuits Voltage Resistance Safety"— Presentation transcript:

1 Current and Simple Circuits Voltage Resistance Safety
Electricity Current and Simple Circuits Voltage Resistance Safety

2 Current Flow of charge Amount of charge flowing per unit time Equation
Measured in amperes, A Amount of charge Time taken Q t

3 Circuit and Symbols A path where electrons can flow
Three important parts Source of energy Battery Power Supply Conducting Path Electrical wires Resistor Fixed resistor Lamp Switch                               

4 Voltage Energy per unit of a charge Equation Unit: Volt, V
“driving force” that pushes charges around the circuit Two basic types emf (electromotive force) pd (potential difference) Energy Charge

5 Resistance Proportional to length of conductor
Inversely proportional to thickness (or cross-sectional area) of conductor

6 Ohm’s Law Current in a resistor is proportional to voltage provided temperature is constant Equation Resistance = Voltage Current

7 Power Energy per unit time Equation Unit: Power =
Joules per second, Js-1 Watt, W Energy Time

8 Types of Circuits Series Circuit Parallel Circuit
One path for charges to flow Parallel Circuit More than one loop or path

9 Current Itotal = I1 = I2 = In Itotal = I1 + I2 + In

10 Voltage Vtotal = V1 + V2 + Vn Vtotal = V1 = V2 = Vn

11 Resistance = 1 1 1 1 + + Rtotal = R1 + R2 + Rn Rtotal R1 R2 Rn

12 Measuring Current and Voltage
Voltmeter Connected parallel to element being measured Current Ammeter Connected in series to element being measured Ohmmeter Measures resistance

13 Safety Fuse Circuit Breaker
Used to regulate the amount of current in the circuit If the current is too high, it opens the circuit Circuit Breaker


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