Changing Current

Added by Craig Napier on Dec 15, 2008

This activity introduces resistors, describing their effect in reducing current in a circuit, and explains the use of rheostats to control current. Students are expected to draw two-column tables to record their measurements, including column headings and units.

This item teaches:

  • the relationship between the current and resistance in a parallel circuit
  • about the use of rheostats to control current
  • the relationship between the current and resistance in a series circuit
  • the resistance equation: potential difference = current x resistance
  • about the applications of resistors

Contents

Objectives

  • The pupil knows that, for a fixed supply voltage, increasing resistance in a circuit will decrease current and vice versa.
  • The pupil understands the function of a rheostat.
  • The pupil can produce a 2-column table with headings, units, and ordered independent variable entries and corresponding dependent variable entries.

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Topic:
Electricity
Product:
Electricity
Tags:
current, resistor, rheostat
Viewed:
1,413 times
 
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