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Understanding Electrical Power: Costing and Magnetic Effects in Currents

In this lesson, we will consolidate our knowledge of electrical power from the previous lesson and explore the costs associated with electricity usage. We will examine how power is calculated and how to determine the cost of electricity. Additionally, we will investigate the magnetic effects caused by an electric current. Key formulas, such as charge (Q = I × t) and electrical power (P = I × V), will be reviewed. A hands-on approach will involve completing electricity consumption tables and understanding the forces acting on a current in a magnetic field.

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Understanding Electrical Power: Costing and Magnetic Effects in Currents

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  1. Force, Energy & Communication Lesson 5

  2. Lesson Objectives • To consolidate our knowledge on electrical power from last lesson • To look at the costing for electricity • To investigate the magnetic effect of a current

  3. REMEMBER! Charge passed = Current X Time (coulombs) (amperes) (seconds) Q = I t Electrical power = Current X Voltage (watts) (amps) (volts) P = I V

  4. Cost of Electricity cost of electricity = power (kW) x time (h) x cost of 1kWh

  5. Copy and complete this table

  6. Copy and complete this table

  7. joules energy twice energy voltage previous subtract To find the number of units used on an electricity bill, ………….. the …………… meter reading from the present one. You pay for the …………. you have used not the ………….. or the current supplied. If a label on an appliance says “1kWh” it means it will use ………….. at the rate of 1000 …………… per second . A “2kW” appliance uses energy …………….. as quickly as a “1kW” appliance. Copy and complete the following summary using these words

  8. Electromagnetic induction

  9. The magnetic force on a current • When a current flows through a wire held between two poles of a magnet there is an upwards force on it.

  10. The magnetic force on a current • The force becomes stronger if… • the current is increased • a stronger magnet is used • there is a greater length of wire in the magnetic field

  11. The magnetic force on a current • The force isn’t always upwards . • It depends on the current and the field directions. • If the wire is in line with the field, there isn’t any force at all.

  12. Lesson Objectives • To consolidate our knowledge on electrical power from last lesson • To look at the costing for electricity • To investigate the magnetic effect of a current

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