Current We can measure the amount of current using an Ammeter. A Current is measured in Amperes (A)

Electrons, Charge & Current Electrons - negative charge. Charge (Q) is measured in coulombs (C) 1C = 6x1018 e What is the charge on ONE electron? 1e = 1.6 x10-19 C The movement of electric charges is called current (I), unit (A). The size of electric current (I) is the rate at which charge flows Time t q note 1A = 1Cs-1

In Series

Current & Ammeters Investigation Place an Ammeter at various point in a circuit with one bulb and measure the current flow Repeat with two bulbs in series Repeat with two bulbs in parallel 1. 2. For each task draw a circuit and record the current values at each point (either side of a light bulb) measured in the circuit. 3. What can you conclude about Current in S & P circuits ???

Dial at 10A 0 to 10 A COM Ammeter

Voltage Voltage is a measure of how much ________ is carried or provided by the electrons. Voltage is measured in Volts (V) , using a Voltmeter. V

Voltage measures the amount of energy carried by a certain amount of charge Energy, measured in Joules (J) Voltage, measured in Volts (V) Charge, measured in Coulombs (C)

In Parallel

Dial at 20V VΩmA COM Voltmeter

What can you conclude about Voltage in S & P circuits ??? Voltage investigation Investigation: Set up a circuit with one bulb and measure the Voltage drop across the bulb (V1) and power supply (Vs) 2. Repeat with two bulbs in series, measure V1 V2 and Vs 3. Repeat with two bulbs in parallel, measure V1 V2 and Vs For each task draw a circuit and record the voltage values for each component, then comment on your observations (ie bulb brightness). What can you conclude about Voltage in S & P circuits ???

Q1. What will happened to the brightness of the bulb when you add more batteries? Explain why Q2. What happens to the bulb in circuit D? Explain why.

The Fiddly Stuff!

V & I in a (series) circuit