1. Electricity and Magnetism: Ac vs DC Mr D. Patterson

2. Outcomes distinguish between direct and alternating currents and potentials, and apply Ohm’s law this will include applying the relationship:

3. DC DC is an acronym for direct current A direct current is formed when charges flow in only one direction under the influence of an EMF

4. AC AC is an acronym for alternating current An alternating current is formed when charges repeatedly change direction as they flow. This is formed by an EMF which alternates in polarity

5. The EMF source determines the current

6. Ohm’s law Ohm’s law defines the relationship between voltage, current and resistance. This can be applied to both DC and AC circuits

7. Ohm’s Law: DC What is the current leaving the battery? 12 V 100 Ω 300 Ω 150 Ω

8. Ohm’s Law: AC What is the current leaving the power source? This question is not as straight forward as both voltage and current vary with time. 100 Ω 300 Ω 150 Ω

9. RMS values

10. Ohm’s Law: AC What is the current leaving the power source? 100 Ω 300 Ω 150 Ω